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AUX air conditioner service manual
Foreword
In order to guide after services of all installation and maintenance agents, provide all necessary
information of AUX air conditioners, and make the whole service network working under the service
concepts of AUX Co. Ltd, we prepare this Service manual.
This Manual is mainly composed of 6 parts: Part I, i.e. Chapter 1, aims to represent basic working
principle of room air conditioners; Part II, including Chapter 2 and Chapter 3, introduces products
available offered by AUX as well as functions and features of the products, and represents overall
exploded views of AUX air conditioners; Part III, i.e. Chapter 4, provides basic disassembly procedure
of AUX air conditioning; Part IV, i.e. Chapter 5, introduces basic troubleshooting workflow of AUX
air conditioning so as to enable service technicians to get basic knowledge of AUX air conditioning
maintenance; Part V, i.e. Chapter 6、7、8、9, introduces common-used maintenance tools of air
conditioning and give some troubleshooting cases of AUX air conditioner for reference. Part VI, i.e.
Appendix 1、2、3, provides all fault codes of AUX air conditioning so as to enable after-sale service
worker to judge the faults quickly and correctly, principle Diagrams of some electric controller and
common-used unit conversion Table are also attached. (In case of any change of Technical parameters
and installation & maintenance methods in this manual, priority shall be given to “instruction
manual”).
Your suggestions and comments are welcomed if there’s any error or omission in this manual. Let’s
improve this Service manual with our joint efforts.
AUX Air Conditioning
2006-01-01
CONTENTS
Chapter 1 The operation theory of the Room Air-Conditioner………………………………………1
Section one- the basic knowledge of pyrology and ventilation…………………………………...1
Section two- the basic knowledge of refrigeration………………………………………………..7
Section three- the basic structure of the air-conditioner…………………………...……………..18
Chapter 2 Introduction of AUX products…………………………………………………………...31
Section one- the basic functions introduction of electric controller………………………….…..31
Section two- the technical parameter of part products………………………………….………..55
Section three- introductions of the optional functions………………………………………..….66
Chapter 3 Exploded views of AUX products………………………………………………...……..68
Section one- E series products………………………………………………………...………….68
Section two- H series products……………………………………………………………….…..92
Section three- M series air conditioner exploded views………………………….……………...112
Chapter 4 The disassembly and the relating attention issues to the part of AUX product……..…..118
Section one- the disassembly and the relating attention
issues to the series products of 9000BTU~12000BTU………………………………… ….……118
Section two- the disassembly and the relating attention
issues to the series product of 18000BTU~24000BTU…………………………………….…....122
Chapter 5 Troubleshooting and electrical chart of AUX air conditioner…………………….….….126
Section one- Basic faults diagnose process of 9000BTU~12000BTU products ………………..126
Section two- Basic faults diagnose process of 18000BTU~24000BTU products……………….132
Section three- Electric wiring diagram of AUX air conditioner…………………………...…….137
Chapter 6 Introduction of the regular service tools for air-conditioner…………………………....144
Chapter 7 Failure Analysis and Inspection of Electrical Control System………………………… 150
Chapter 8 Troubleshooting guide for Refrigerating System ………………….……………...…....162
Chapter 9 Maintenance Cases of Noise and water leakage of AC………………………..…..……179
Section one- cases of air conditioner noise reduction………………………………..………….179
Section two- maintenance cases for water leakage of air conditioner………………..…...…….185
APPENDIX 1 Introduction to the fault display CODE of AUX air conditioner……………..……192
APPENDIX 2 Schematic Diagrams of some Controller Board……………………………...……198
APPENDIX 3 Conversion Table of Major Units………………………………………………….202
AUX air conditioner service manual
Chapter 1
the operation theory of the Room Air-Conditioner
Section one
the basic knowledge of pyrology and ventilation
1. Basic Definition
⑴ Temperature
Temperature is a physical value for the definition of the percentage of the cold and heat to an object.
It’s the one of those basic parameters used in confirming the substance’s status. Currently, the world
standard common thermometric scales include the absolute thermometric scale, the Celsius scale, and
the Fahrenheit scale.
The Celsius scale is the most common thermometric scale in usage that has 100parts between the
freezing point of 0℃ and the boiling point of water of 100℃ under a standard atmosphere (760mmHg,
e.g.1.013×105Pa). Each part is one centigrade with the abbreviation of 1℃, and usually a “t” stands
for its reading. The Fahrenheit scale has 180 parts between the freezing point at 32℉ and boiling
point at 212℉ of water under a standard atmosphere. Each part is one Fahrenheit with the
abbreviation of 1℉, and usually a”t1” stands for its reading. All the temperatures defined by the
Celsius scale and the Fahrenheit scale are called relative temperature.
Absolute temperature is also called thermodynamics scale or Kelvin scale, which is adopted in the
International Unit System. It deduces the temperature at the absolute stop stage of the heating activity
of the molecules inside the substance is 0 degree (e.g. -273.15℃), which the absolute temperature is
stood for by “K”. Usually, a “T” represents its reading. 1K of the absolute temperature scale is
absolutely equal to 1℃ of the Celsius scale on value.
The conversion relation between the Absolute temperature T, the Celsius scale t and the Fahrenheit
scale t1 is as below:
t=T-273.16≈T-273(℃)
F= (9/5) t+32(℉) =1.8t+32(℉)
The glass thermometer, thermocouple thermometer, Electric-Contact Thermometer, resistance
thermometer and semiconductor thermometer are the common meters in measuring the temperature
during the refrigeration project.
⑵Pressure
The pressure means Force applied uniformly and vertically over a surface, measured as force per unit
of area. It’s also called intensity of pressure by the express of “P” with the unit Newton/m²(N/m2) in
the shortened form Pa. In addition, there are other expresses by the way of kilogram force（kgf/cm2),
liquid height(mmHg 或 mmH2O), and atmospheric pressure（atm）or bar etc.
The conversion relation between the above pressure units is as below:
Table 1-1 the Pressure Units Conversion Table
Unit
Pa
kgf/cm2
Atm
mmHg
Psi
-5
-6
-3
Pa
1
1.02×10
9.87×10
7.5×10
1.450×104
kgf/cm2
9.8×104
1
9.68×10-1
7.36×102
1.421×109
Atm
mmHg
Psi
1.013×105
1.333×102
0.68948×104
1.033
1.36×10-3
7.0327×10-2
1
1.316×10-3
6.80517×10-2
7.6×102
1
51.711
1.46885×109
1.93285×106
1
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AUX air conditioner service manual
The pressure is distinguished by gauge pressure and absolute pressure applied in the practice.
The gauge pressure is validated according to the numerical value shown on the pressure gauge. This
value, based on an atmospheric pressure (0), is the difference of the actual pressure of the tested gas
and the ambient atmospheric pressure. If the value is lower than the atmospheric pressure, then it will
be negative and called vacuum value (B).The surface pressure is applicable for the observation use
during the operation and running period of the refrigeration system. For example, when a negative
value appears to the pressure gauge of refrigerant, it means the refrigerant in the refrigeration system
totally leaks out.
Positive Pressure
Surface Pressure
One Atmospheric Pressure
Negative Pressure
Vacuum Value
ABSOLUTE PRESSURE
The absolute pressure is the actual pressure value of the gas, which is equal to the sum of the surface
pressure and the atmospheric pressure, e.g. Pa= Po+Pg. Pa stands for the absolute pressure, “Po”
stands for the atmospheric pressure and “Pg” stands for the surface pressure.
The relation between the absolute pressure, the surface pressure and vacuum value are specified in the
below picture1-1:
Absolute Pressure upper limit line
Absolute Zero Pressure line
⑶Specific Volume
The specific Volume is the dimension for the substance with unit mass. υ stands for it and the unit is
meter3/ kilogram( m3/kg) or Liter/kilogram(L/Kg). The specific volume of the vapor refrigerant is the
key parameter in determining the cooling capacity of the compressor.
Specific Volume is the physics parameter in description of the compression level of the molecules in
the substance. For Gas, if more large space between the molecules is, the larger the specific volume
will be, consequently the compression level will be smaller and the compressibility will be more.
Otherwise, the specific volume will be smaller, and consequently the compression level will be larger
and the compressibility will be less.
The density (ρ), the reciprocal of the specific volume, is always being applied in the refrigeration
technology, e.g.:
υ=1/ρ 或 υ•ρ=1
Density is the mass of the unit dimension of the substance with the unit of kg/m3 (Kilogram/meter3).
The density of the liquid is higher than the one of the gas, which is the theory, sourced from and
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AUX air conditioner service manual
applied in the separating process by the gas & liquid separator.
⑷Heat Energy
The heat energy of the substance, the internal energy, is the sum of the kinetic energy and potential
energy. The quantity of heat is the physics parameter for measuring the heat absorbed or released by
the physical object, and is one of the representation forms of energy. The essential of the heating
process of refrigeration is the process of transmitting heat energy. The signification of the quantity of
heat is only effective during the heat energy’s transmitting period.
The common units in measurement include Joule or Kilo-Joule (KJ). 1J means the energy in need for
rising up the physical object with the weight of 1Newton up to 1 meter height. In addition, there is
Calorie or Kilo-Cal (Kcal) as the common units applied. 1Kcal stands for the absorbed or released
quantity of heat for having the temperature of 1kg pure water to be increased or decreased by 1℃.
British thermal unit (BTU) is applied mainly in Europe or USA. 1BTU stands for the absorbed or
released quantity of heat for having the temperature of 1pound pure water to be increased or decreased
by 1℉. The conversion relation of all the above units is as below:
1kJ＝1000J
1kcal=1000cal
1kcal=4.1868kJ
1BTU=0.252kcal=1.055kJ
1kcal=3.968BTU
1kJ=0.9478BTU
1W=0.86kcal/h
1HP=745.7W
1USA Refrigeration Ton(USRT）=3.024kcal/h=3576W
1 Japanese Refrigeration Ton（RT）=3320kcal/h=3860W
The relation of the temperature and the quantity of heat: The physical object’s temperature will
decrease if it releases the quantity of heat and consequently cause the increase to the ambiance
temperature. Otherwise, the physical object’s temperature will increase if it absorbs the quantity of
heat and consequently cause the decrease to the ambiance temperature. In this case, it’s easy to
understand that the principle of the heating process is the heat releasing process by the object which
increases the temperature of the ambiance medium accordingly; the principle of the refrigerating
process is the heat absorbing process by the object which decreases the temperature of the ambiance
medium accordingly.
2. The heat transmission forms
There must be a heat transmission process available either the quantity of heat shall be delivered from
one substance to the other one or the quantity of heat shall be absorbed by one object from the other
one. The heat transmission forms are consisted of heat conduction, convection and heat radiation. The
three of them normally function at the same time during the actual heat transmission process in no
spite of the single transmission form of them available only.
⑴Heat conduction
Heat conduction is one of the heat transmission forms in the form of transmitting the quantity of heat
from one object to the other one, or the heat transmission available between two contacting objects.
For example, when you hold one end of the iron bar, and the other end is on the fire, after a while,
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AUX air conditioner service manual
your hand will feel heated.
Different materials have different heat conductivity. In this case, the heat conductivity coefficient was
introduced as the unit of the value for measuring purpose. Such coefficient represents the amount of
heat that passes by conduction through a one meter thickness of homogeneous material, per one hour
and per one square meter Measured as 1℃ difference between the two surfaces of the material. Its unit
is kJ/ (m.h.℃) and stood for by symbol λ.
The heat conductivity coefficients of some common materials are listed in table 1-2.
The quantity of heat “Q” transferred from the surface is directly proportional to the heat conductivity
coefficient of the material, temperatures’ difference, dimension of the surface and the heat
transmission time while inversely proportional to the surface’s thickness. See Graph 1-4. The Algebra
expression formula is as below:
(kJ)
Q=λSZ（t1-t2）/δ
In the expression formula:
λ——Stands for the heat conductivity coefficient of the material. kJ/（m·h·℃）；
Ｓ——Stands for the surface dimension，m2；
δ——Stands for the thickness of the surface，m；
Ｚ——Stands for the heat transmission time ，h；
t1、t2——The temperatures of the two surfaces，℃。
Table 1-2 the heat conductivity coefficients of some common materials
Material
λ（kJ/m·h·℃）
Material
λ（kJ/m·h·℃）
Copper
1382
Softwood
0.17-0.25
Aluminum
733
Air casing
0.25
Steel
163
Water
2.1
Frost layer
2.1
Glass
2.7-2.9
Glass filament
0.17-0.21
Wood
0.25-0.34
Glass wool
0.13
Plywood
0.62-0.84
Polyester formed
Slag wool
0.21-0.34
0.042-0.11
plastic
⑵Convection
The transfer of the quantity of heat caused by the relative movement of the fluid at higher temperature
and the fluid at lower temperature is called convection heat transfer. The convection is only applied to
and only specifically exists in the fluid and gas. The convection heat transfer exists between the fluids
or may exist between the fluid and solid, and may be accompanied by the heat conduction. The main
heat transmission applied in the refrigeration technology usually contains the heat conduction and
convection. The coefficient α stands for the intensity of the convection heat transfer and mainly
affected by the flow speed of the fluid.
The types of convection heat transfer include natural convection and forced convection. Natural
convection is formed by the changes to the density of the molecules of the liquid or gas, such as the
cooling function of the refrigerator’s condenser is mainly based on the effected natural convection of
air. The forced convection is formed and caused by the accelerating flow speed of gas or liquid being
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AUX air conditioner service manual
impacted by force, for example the convection of the refrigerant inside the pipes caused by the impact
from the compressor of the refrigerator and air-conditioner, and the forced convection to the condenser
and evaporator impacted by the fan. The heat transfer coefficient is directly proportional to the flow
speed of the forced convection. So, the fan can be utilized as a forced convection tool for creating the
effective heat transfer.
⑶Heat Radiation
Heat radiation represents the transmission of the radiation energy turned from the heat energy existing
in the space between two indirect touching objects. Any objects continuously emit the radiation energy
and absorb the radiation energy so as to turn it into the heat energy. Comparing with the heat
conduction and heat convection, heat radiation can be realized through the vacuum space without any
heat and middle medium. The heat transmitting process from the Sun to the Earth is by the way of
heat radiation.
The intensity of the object’s radiation energy is directly proportional to the forth power of the absolute
temperature value. In this case, the final efficient result of the radiation is that the object at higher
temperature will loss energy and the one at lower temperature will receive energy. Despite of the
above factor, the intensity of the radiation energy is also relative to the property of the object’s surface.
More black or rough the surface is, more easy in radiating or absorbing heat. The white and smooth
object can hardly absorb the heat, but be good at heat reflection. Because of this, the condenser of the
refrigerator is painted in black color for strengthening the capability of radiation, and the shell surface
of the refrigerator is light and brilliant so as to reduce the absorbance caused by the radiation from
other objects.
3. The State Parameter of air
⑴ The temperature of air
The temperature of air represents the heat extent of the air. Usually Celsius temperature scale t（℃）
was introduced to stand for it.
⑵ The pressure of air
The pressure of air in the nature is atmosphere pressure. Since the air is the mixture of dry air and
water vapor, the air pressure is the sum of the pressures of dry air and water vapor. The value of the
water vapor pressure is a parameter reflecting the quantity of the water vapor in the air.
The total air dimension is always full of the water vapor molecules. The temperature value we
obtained is not only the one of the dry air but also the water vapor’s. In this case, the volume or the
temperature of the water vapor is equal to the volume or the temperature of the air respectively. The
weight of the air is the sum of the dry air and the water vapor.
⑶ Humidity
Humidity is one of the physical parameter for representing the quantity of the water contained in the
air. There are absolute humidity and relative humidity as the specific definition for it. The absolute
humidity(kg/m3 或 g/kg) means the weight of the water contained in 1kg air. The relative humidity
(RH %) means the percentage ratio of the current absolute humidity to the saturated absolute humidity
under a certain ambiance temperature. It’s difficult to measure the water weight directly in the air in
practice. Since the pressure created by the water in the air is in direct proportion to the quantity of the
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AUX air conditioner service manual
water in the air within the temperature zone under 100℃, the absolute humidity can be represented by
the pressure value created by the water vapor in the air. The pressure unit is: Pa.
Less relative humidity means more dry of the air. Zero percent of the relative humidity value means
100 percent dry air. 100 percent of the relative humidity means the saturation humidity of the air. The
value of the relative humidity is measurable by the hygrometer. There are various types of
hygrometers, such as the Dew Point hygrometer, hair hygrometer and psychrometer, etc.
⑷ Enthalpy
The heat energy is the sum of the Kinetic energy and the potential energy. It always exists in the
material due to the always-nonstop motion of its molecules no matter of any states they stay in. The
heat energy in a certain state contained in one-kilogram material is the enthalpy of this material.
The enthalpy of the air is composed of the one of the dry air and water vapor, which is represented by
“i”, unit kJ/Kg.
4. Air conditioning
Piture.1-2 is an air conditioning system:
4
5
2
3
1
1.
2.
3.
4.
The controlled working zone(also called Air conditioning zone)
Air transmitting system
Fresh air being filtered
Sun radiation
5. Outdoor temperature Change
The above drawing shows the heat source, humidity source or other harmful materials, in one aspect,
come from the production process of the indoor environment and the heat or wetness produced by
human body, and on the other hand is caused by the changes of the sun radiation and climate condition
of the outdoor environment. In this case, the idea of air conditioning that aim to control the air
environment by artificial method is bourn for eliminating the indoor and outdoors influence factors
subject to the environment. The air conditioning functions mainly by the way of air temperature
conditioning, humidity conditioning, airflow speed conditioning and air cleanliness conditioning.
⑴Temperature conditioning
The purpose of temperature conditioning is to maintain an appropriate temperature for the indoor air.
The appropriate indoor temperature value is: 25-27℃ for Summer ， 18-20℃ for winter. The
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AUX air conditioner service manual
temperature value shall be determined by the industry & mineral enterprises, scientific & research
institutes, medical and sanitary units according to their own specific purposes.
The process of air temperature conditioning is substantially the process of adding or reducing sensible
heat. The value of the air temperature also expresses the quantity of the sensible heat of air.
⑵Humidity conditioning
In addition to maintain an appropriate indoor temperature, there is also a demand for maintaining an
appropriate indoor humidity. The human body will feel comfortable if the relative humidity is between
50%-60% in the summer and 40%-50% in the winter.
The process of air humidity conditioning is substantially the process of adding or reducing latent heat.
The quantity of the water vapor contained in the air shall be conditioned during this process.
⑶Airflow conditioning
The temperature and humidity conditioning can be realized only by the way of air flowing. In this case,
the airflow conditioning is vital in air conditioning process. The airflow conditioning and distributing
directly impact the operation effectiveness of the air conditioning system. The air re-circulating speed
in an air-conditioned room shall not over than 0.25m/s.
⑷Air cleanliness conditioning
The harmful gas and dust existing in the air easily penetrate into the human being’s windpipe and lung,
etc, and all the dust are usually accompanied by the infecting virus to cause kinds of sickness. So, the
filtering process to the air is quite necessary during the air conditioning process. The air cleanliness
methods include: Ventilation & filtration, adsorption, absorbance and catalyzing combustion etc.
Section two
the basic knowledge of refrigeration
1. Refrigerant
Refrigerant is also called refrigeration Working Medium. The first letter “R” of the English word
“Refrigerant” stands for it. It absorbs the heat by boiling away the liquid through the variety of its own
state in the refrigerating device and transfers the heat released from the gas’ liquefaction process to the
surrounding medium materials inside the condenser with the impact of the third party’s work. The
state variety of the refrigerant within the system is a kind of physical variety with the only function of
absorbing heat and transferring heat but without any change to its property. There are around more
than eighty kind of refrigerant available now and some others are under development.
⑴The Refrigerant kinds
According to the chemical composition, the refrigerants can be classified as follows:
①Inorganic compound refrigerant
These kind refrigerants were applied earlier for refrigeration purpose, such as the air, water, Ammonia
and Carbon dioxide etc. Among them, some were washed out already. The typical sample is Carbon
dioxide with the disadvantage of high working pressure, low critical temperature, small capacity per
unit and low refrigeration performance. As the replacement item, the Ammonia is one of the Inorganic
compound refrigerants being applied widely. R717 stands for it.
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AUX air conditioner service manual
②Freon species refrigerant
They are the ramifications of methane and ethane with the changing character in consequence of the
quantities variety of the atoms of fluorine, hydrogen and chlorine. The best option for choosing a
chemical compound at the vaporizing temperature of -130℃ to +80℃ is the one with quite more
fluorine atom in consideration of the easy application of the refrigeration technology, because the
compound with more fluorine atom has less toxicity and can maintain a higher chemic stability. In
addition, the compound with less hydrogen atoms has less possibility in explosion and inflammation,
and if with more chlorine atoms the evaporation temperature will be higher. The more information
about the character of Freon will be specified in details in the following paragraphs.
③Azeotropic mixture refrigerant
They are the mixture of two or above than two types Refrigerants in certain percentage. Their
character is same as the one of the single compound that maintains the invariable evaporation
temperature under the fixed pressure. However, the component of their vapor phase and liquid phase
are same and retain in the same.
Azeotropic mixture has some distinguished character comparing with the single refrigerant, such as
low evaporation temperature, large capacity per unit refrigerant and low compressor discharge
temperature etc. So the application of the azeotropic mixture can enhance the performance of the
refrigerant.
In compliance with the national regulation, “R” is the symbol standing for the refrigerant. The
refrigerant can also be classified in three types according to the level of evaporation temperature and
the condensing pressure value under normal temperature as the description in table 1-3:
Table 1-3 The classification of refrigerant
The condensing
Rated
pressure under
Refrigeran
Types
evaporation
Application Range
normal temp.
t
temperature(℃)
（Mpa）
High
R11
Applicable in the centrifugal
temp. and
R21
>0
<1.96-7.94
compressor of the
low
R113
Air-conditioning system.
pressure
R114
Middle
R717
Applicable in the piston style
temp. and
R12
compressor of the
-70-0
<19.6
middle
R22
air-conditioner or the
pressure
R502
freezing store system
Applicable in the refrigerator
R13
Low temp.
system with the temperature
R14
and high
<-70
1.96-68.8
lower than -70℃ or the low
R23
pressure
temperature parts of the
R503
cascade multiple system
2. The requirement to the refrigerant
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AUX air conditioner service manual
⑴The requirement for the thermodynamic character
The basic requirements the refrigerant shall meet are:
①Under the standard atmosphere pressure, the evaporation temperature must be low and generally
shall not higher than -10℃. The pressure value under the normal evaporation temperature shall be
higher or closed to the atmosphere pressure value in case of the air’s in leakage to the system.
②The condensing pressure of the refrigerant shall not be too high and generally shall not exceed
1.17-1.47 Mpa if within the range of the working temperatures. Otherwise it will add extra burden on
the intensity of the refrigerating devices and increase the power consumption subsequently.
③The capacity per unit refrigerant shall be large enough. It is the common understanding that the
refrigerant with the larger capacity per unit refrigerant can achieve larger quantity of refrigeration if at
the same cylinder diameter and same strolling stroke. However, as the exception, for the centrifugal or
mini type compressor, the preferable choice is the refrigerant with low capacity per unit refrigerant in
consideration of the convenience in machine design and manufacture.
④The critical temperature for the refrigerant shall be high enough in order to be liquidized at the
normal temperature or even the normal low temperature. The freezing temperature point shall be low
enough in order to be evaporated at a low evaporation temperature.
⑵The requirement for the physical and chemical character
①The adhesiveness and density of the refrigerant shall be low enough in order to have a free cycle
environment without too much resistance in the system.
②The refrigerant shall have the perfect performance in heat-exchanging in order to enhance the
efficiency of the complete refrigerator or air-conditioner.
③The refrigerant shall have a certain function of water-absorbing so as to maintain the normal
operation with no “ice block” when there is small water available in the system.
④The refrigerant shall be with a certain chemistry stability character for avoiding the chemolysis at
the high temperature, the corrosion to the material of the preparation, the inflammation and explosion
within a normal working pressure and temperature ranges; It also shall be with no much solubilization
or inflation impact applied to the hermetic material and with no chemical reaction to the lubricating
oil.
⑤The refrigerant shall be free of harm to the health of human beings and with no irritant.
3. The characters of the common refrigerant product:
There are many kinds of refrigerants available, the below are the typical types:
⑴Fluorine 22(CHF2Cl）
①Fluorine 22 with no character of inflammation and explosion. Its toxicity is deeper than R12’s, and
its solubility limit is higher than R12’s but also may form the phenomenon of “ice block”.
②Part of R22 can be solubilized by lubricating oil. The solubility limit is variable according to the
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AUX air conditioner service manual
specific type and temperature of the lubricating oil.
The capacity per unit of R22 is almost same as the one of R717 while it will be higher than R22
under a low temperature.R22 is usually applied in the middle temperature refrigerating systems with
the object lowest refrigerating temperature of up than -60℃.
⑵ The property of the replacement cold medium of R407C, R410a, etc.to R22
The properties comparison between R410A, R407C and HCFC22 is listed in table 2-2. We can make a
conclusion as the below after checking through this table:
①The environment-protection condition of the replacement cold medium is superior than R22 and
conforming to the safety requirement.
② R407C is non-azeotrope and need to be rectified according to the specific condition in
air-conditioner design, production and maintenance process; R410A is sub-azeotrope and basically
can be treated as R22.
③The pressures of R407C、THR03 and R22 are basically same. But the one of R410A is higher than
R22’s by 60%;
④The lubricating oil for the replacement cold medium is different from the one for R22 and need to
be changed completely. However, due to the water-absorption of the Polyarylether, the control on
drying process must be strict;
⑤R407C, THR03 and R22 are basically same on the aspect of the capacity per unit refrigerant. The
capacity per unit refrigerant of R410A is more than R22 by 40～50％.
Table 1-4 the basic property of the replacement cold medium
Property
R-22
R-410A
The makeup of the cold medium
（Mass ratio ％）
Environment
Condition
Safety
Thermophysical
Properties
Refrigerating
Property
R-22
R32/R125
100
50/50
R-407C
R32/R125/
R134a
23/25/52
Ozone’s destruction
Potential (ODP)
Greenhouse GWP（100
years）
Toxicity
Inflammability
0.05
0
0
1730
1700
1530
Azeotrope property
---
Boiling point（℃）
Critical temp.（℃）
Condensing pressure（Mpa）
Evaporating pressure（Mpa）
Pressure ratio
Exhaust Temp.（℃）
-40.8
96.1
2.17
0.62
3.50
97.2
SubAzeotrope
-52.7
72.5
3.38
1.00
3.38
95.1
No
No
NonAzeotrope
-43.7
87.3
2.31
0.64
3.59
86.7
No
No
10
No
No
AUX air conditioner service manual
Lubricating oil
Slippage temp.℃）
Capacity of refrigeration
（%）
COP（%）
Lubricating oil
Mutual solubilization
0
<0.17
4～6
100
141
101
100
Mineral oil
Good
92.5
POE
Fair
97
POE
Fair
2. The theory of refrigeration
There are many methods in artificial refrigeration. The most popular one among of them applied in
practice is the steam-compressing type. It completes the refrigeration task with the help of some fluid
of low evaporating temperature which can maintain a stable temperature while absorbing and reducing
the quantity of heat from the surrounding mediums during evaporate period. The temperature
reduction function of the air-conditioner is mainly realized by the refrigerating cycle. The
steam-compressing model refrigeration system, as shown in Picture 2-1, includes the most essential
refrigerating cycle composed of four parts: 1.Compressor; 2.Condensor；3.Throttle device（Capillary
tube or expansion valve）
；4.Evaporator，which are connected in turn by the pipes and form an airtight
system.
Its working process is: The liquid refrigerant absorbs the quantity of heat from the evaporator and then
will be gasified as gas at a low pressure and temperature. The compressor will suck this gas from the
sides of the evaporator and compress the gas (The pressure will turn high at the moment) through its
mechanism energy transferred from the electricity energy. With no stop, the mechanism energy turns
into the heat energy for increasing the temperature of the compressed gas (Super- heating gas) and
force it enter into the condenser. The compressed gas with high pressure and temperature will
undertake the heat exchange (heat release) process with the air (or heat source) around the condenser
and will be cooled and condensed as liquid with high pressure and middle temperature (Super-heating
gas, about 95℃)→saturated→gas→wet→gas→saturated liquid→super-cooling liquid（46℃）, the
pressure value basically maintain the same (About 19Kgf/cm, and temperature is down). Because the
narrow diameter of the capillary tubes creates the resistance during the flow of the processed high
pressure and super-cooling refrigerant, the speed of the refrigerant flow will be accelerated, the
pressure will be lower down, the temperature will fall and accompanied with the tiny gasify
phenomenon. The refrigerant’s temperature （about 7℃、5Kgf/cm）, after passing through the
evaporator, will be lower than the ambiance temperature, and will turn into a gas state gradually from
the low pressure and wet steaming state after having sucked the heat from the ambiance mediums that
accelerate its gasify process. The way of its heat-absorbing results in the decline of the ambiance
temperature and consequently achieves the target of air-conditioning.
As the description of the above, the refrigeration system is continuously circulating by the way of
compressing →condensing→throttling →evaporating→compressing. With the function of promoting
the pressure of the refrigerant and transferring the refrigerant into continuous circulation, the
compressor is the heart of the whole system. The throttling components undertake the function of
flow-throttling, pressure-reduction and flow quantity –adjusting towards to the refrigerant entering
into the evaporator. However, the refrigerant is the blood of the refrigerating cycle for taking the
responsibility of transferring the quantity of heat; It releases the heat absorbed from the evaporator and
the one produced by the compressor to the air around the condenser for realizing the target of
refrigeration by continuously absorbing heat from low temperature mediums and releasing heat to the
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high temperature mediums.
It’s absolutely necessary to a refrigeration system without lack of the Compressor, Condenser, Throttle
device and Evaporator. As to the other auxiliary parts, they are configured and constructed in order to
promote the economy, the reliability and the safety of the system.
3 The defined terms of air-conditioner in common use
⑴Heat pump:
The heat pump is a refrigerating system that absorbs the heat from the outdoor low temperature air and
release the heat to the indoor air so as to have a calefactive indoor air by changing the flowing
direction of the refrigerant. It also includes the air circulating and purifying devices as well as the
damping and ventilation.
⑵Cooling capacity
It means the total quantity of heat per unit time removed by the air-conditioner from the closed space,
room or area under the rating working status and specified condition. Unit: W or BTU.
⑶The consumed power for cooling It means the total input power for air-conditioner’s refrigerating
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operation under the rating working status and the specified condition.
⑷Heating capacity
It means the total quantity of heat per unit time transferred by the air-conditioner to the closed space,
room or area under the rating working status and specified condition. Unit: W or BTU.
⑸The consumed power for heating:
The total power input for air-conditioner’s heating operation under the rating working status and the
specified condition Unit: W.
⑹Energy and efficiency ratio (EER)
It means the ratio of the cooling capacity to the effective input power consumption occurred during
the air-conditioner’s refrigeration process under the rating working status and the specified condition.
W/W stands for the value of the ratio.
⑺Coefficient of Performance (COP):
It means the ratio of the cooling capacity to the effective input power consumption occurred during
heating process of the heat pump of the air-conditioner under the rating working status and the
specified condition. W/W stands for the value of the ratio.
Note: * The effective input power consumption stands for the average electric power inputted to the
air-conditioner within a unit time, which includes:
① The input power shared for the operation of the compressor and the input power for
defrosting.(Except the auxiliary assistant electric heating devices with no aim to
defrosting);
② The input power of all control and safety devices;
③ The input power of the heat exchange transferring devices(Fan and pump);
Energy efficiency ratio (EER): It means the ratio of the cooling capacity to the effective input power
occurred during the air-conditioner’s refrigeration process under the rating working status and the
specified condition. W/W stands for the value of the ratio.
⑻The volume of circulating air (The volume of air delivered to room):
The volume of air delivered by the air-conditioner to the airtight space, room or area per unit time
under the rating refrigerating working condition when the aeration door and the ejection door are
closed thoroughly (If applicable). The unit of the volume of air delivered is: m3/s（m3/h）.
⑼ Air enthalpy-difference testing method
It’s a test method being applied in the measurement of the air-conditioner’s performance of cooling
and heating. The parameters in the need of the test include the outlet air parameter, the inlet air
parameter and the volume of the circulating air of the air-conditioner. The performance of the
air-conditioner is determined by the product of the volume of air and the difference between the
enthalpy values of the outlet and inlet air.
The cooling capacity of the air-conditioner is relating to the area of the room, room’s usage, room’s
orientation, and the floor it at, the room’s heat preservation capability, the quantity of heat from other
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electrical appliances and other factors. Basing on the experience, we can set the value of
150—240W/M2 (120—300W/M2 is applicable in more large room or space) as the cooling load per
unit working area, and the actual applicable coverage area of the air-conditioner is the result of the
cooling capacity being divided by the cooling load. For example: ASW-H12A4/HSA the cooling
capacity is 3200W, the minimum applicable coverage area is 3200/240=13M（about）, and the
maximum coverage area is 3200/150=21M.
Table1-5 the quantity of refrigeration in need for specific situations:
Type
Qty. of
type
refrigerati
on (w/M)
Ordinary family room
170
Hotel room ( close type)
Garret family room
220
Hotel room (open type)
Ordinary office room
200
Hotel hall
Haircutting house or shampoo 280
Conference room, projection room
Salon
Front hall of hotel or Interval 420
Family living room and dining room
room
Garment shop and Jewelry shop
220
Chess & card playing room and tea room
Qty. of
refrigerati
on (w/M)
160
140
220
320
200
240
The above is the estimation to the applicable area mainly in according to the cooling capacity. Due to
the available temperature difference and the sense difference by different people to the heat energy, the
quantity of heat load is usually bigger than the one of cooling load per unit applicable area according
to the practice experience, and generally about 180-270W/M.
⑽The time for temperature’s drop and rise:
After an air-circulating all over a room by the air-conditioner, because of a heat temperature difference
12--15℃ available between the inletting room temperature and evaporating temperature, people may
feel an obvious drop happens to the room temperature. Such as one set of 3.2Kw air-conditioner that is
applied to a room with area 13—21M², height 2.8M will achieve an obvious temperature drop within
（13—21 M²）*2.8M/500M/h=0.0728—0.01176h=4.4—7.1min. However, due to the distinct heat
storing capacity of the wall, window & door, furniture, ornaments etc., the drop of temperature will
take more time and even the temperature of the cooled air may contrarily rise up after having touching
them; In addition, the stable operation of the air-conditioner also need some time since the
refrigeration system just start up. In this case, the above calculation method presented and
recommended as the theory reference only.
⑾The cable, ammeter and the quantity of electricity consumption
Usually, the electric connecting cables (include the plug cable) are already assembled by the
manufacturers to the air-conditioner system and with no extra cost or labor for users. But the cable
from the socket to the switchboard must be laid out by the user before installation. Since the
air-conditioner is the largest one in consuming electricity among the home appliances, the special and
exclusive circuitry (Direct sourced from the total electrical source), and must be equipped with the
earth lead. The dimensions of the leads are required as the below:
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AUX air conditioner service manual
The rating current (A) of The section area of the plastic insulated leads (mm²)
the air-conditioner
Copper core
Aluminum core
(As per the nameplate)
＜＝6
1(1.5)
2.5
6-10
1.5(2.5)
2.5
10-16
2.5(4)
4
16-25
4(6)
6
25-35
6
10
Note:
①Aluminum leads are not recommended in use;
②Larger section area shall be better in use as recommended
The division of the ammeters, such as doubleness ammeter、quadruple ammeter etc., are determined
by their endurance capacity to the specific electricity currents. For example the 2.5A doubleness
ammeter means the maximum electricity capacity it can endure is 5A; the maximum electricity
capacity of the quadruple ammeter is 20A. So, the user must ensure the total rating current shall less
than the maximum capacity of the ammeter, and good consideration of the other appliances’ electricity
consumption at home.
⑿The electricity consumption of the air-conditioner: The consumption power, the electricity heating
power and the auxiliary electricity heating power (if applicable) can be identified from the nameplate
of the air-conditioner and can be used for the estimation of the quantity of electricity consumption. For
instance, if the rating refrigerating consumption power is 1200W for one air-conditioner, and 1
kilowatt-hour =1kW/h, then the quantity of electricity consumption of this air-conditioner is
1200W*1h=1.2kW/h=1.2kilowatt-hour. The rating power on the nameplate is validated by the
manufacturer under a certain indoor or outdoor temperature and humidity (Indoor dry bulb 27℃、wet
bulb19℃，outdoor dry bulb 35℃、wet bulb 24℃ ), however, due to the incomplete same condition of
the indoor and outdoor either on the condition of the temperature and humidity or the testing
environment, the consequent actual power consumption may be different from the rating consumption
power. Generally speaking, in terms of refrigeration, the higher environment temperature (the more
atrocious condition) it is, the bigger actual consumption power of the air-conditioner will be. The table
of the below shows the basic parameters of all specific type of air-conditioners:
Table1-6 basic parameters of all specific type air conditioners
Specification Capacity(About)range Power(about)range Current
Qty. Of Electricity
range
consumption
1 Hp
2000-3000w
650-1100w
3-5A
0.6-1.2
1.5 Hp
3000-4000w
1100-1600w
5-7.2A
1.0-1.7
2Hp
4000-5600w
1600-2200w
7-10A
1.5-2.3
3Hp
6000-8500w
2200-3300w
10-16A
2.1-3.4
5 Hp
10000-14000w
3500-5800w
6-10A
3.4-6
(Three
phase)
Note: The above doesn’t include the electricity heating power.
⒀The conception of Hp and the general unit conversion
The Hp said by the distributors or the shops usually indicates the power of the compressor of the
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AUX air conditioner service manual
air-conditioner. Although the unit “W” is same as the one used for the cooling capacity, they have
different practice signification: As we all know 1Hp=735.499W, which stands for the consumption
power of the compressor, but the cooling capacity indicates the quantity of heat absorbed from the
room by air-conditioner within a unit time. So, somebody may ask: is this against the energy
conversation law? The answer is: we shall consider about the energy conversation law in a total
air-conditioning system: e.g. the power consumption of the compressor (+other power consumption by
fan and motor etc.) + the quantity of heat (e.g. the cooling capacity) absorbed from the room=the
ejecting quantity of heat by the (Outdoor part) air-conditioner.
The general units’ conversion is as follows:
1Hp (or 1 Horse Power) =735.499W the abbreviation is 735W (British unit Horse Power=745.7W)
1W=0.86kcal/h(Kcal. or Therm)
1kcal/h=3.9683Btu in abbreviation of 4Btu
1W=3.412Btu/h
1cooling ton=13878kJ/h=3330kcal/h=3873W (US cooling ton and Japanese cooling ton)
t Celsius degree (℃)=T absolute temperature (K)-273.16
t Fahrenheit (℉)=9/5t+32(℉)
1Pa=1.02*10-5kgf/cm²
⒁The noise of air-conditioner:
It’s not allowed to have the strange noise and vibration when the air-conditioner is running. The
regulations with regard to this issue are specified as following:
①The error is permitted by the manufacturer if +3dB(A) in difference with the announced figure (by
nameplate, manual or adv. Etc.) of the air-conditioner’s noise.
②T1、T2 model air-conditioner shall be tested in the Semi-anechoic Room, There are 2dB(A) can be
added to T3, Sound Pressure Level.
③The noise value obtained from the anechoic room must be noted by the letters of “Tested in the
overall noise eliminated room”.
④The difference between the noise level + interference and the rating noise value shall not less than
10dB (A) when the noise test ongoing.
⑤The ground shall be the reflection surface when there is semi-noise eliminated, and the noise space
is consisting of 2 indoor and outdoor rooms.
⑥The measurement to the noise shall be undertaken 30 minutes later after the air-conditioner running
normally and when the ambiance temperature reach ±1.5℃ of the rating working status.
⑦The measurement shall be undertaken at the point of 1meter height and 1 meter far away to the
front panel of the air-conditioner.
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AUX air conditioner service manual
20dB
30dB
40dB
50dB
60dB
Table1-7 the noise to the sense of the human beings:
Silence
Broadcasting room with nobody in
Very quiet
The odium with nobody in
Almost insensible to the noise
Inside the quiet library
Feel the noise
The quiet hotel hall
quite sensible to the noise
The ordinary dining room of the plant
⒂ 3C Certification:
It’s the abbreviation of China Compulsory Certification, which is aiming to test and evaluate the
electrical safety (and structural safety etc.), the conformity of the electromagnetism compatibility of
the products. E.g. the combination of the former Great Wall certification pluses the test of the
electromagnetism compatibility. The electromagnetism includes EMS (the sensitivity of the
electromagnetism e.g. the resistance performance against the interference of the electromagnetism)
and EMI(interference of the electromagnetism); the performance of the EMI mainly includes: 1. the
interference to the electrical net; 2 the radial interference through the connecting cable of the electric
power source.
⒃CE certificate
This certificate, pushed by the EU, is a safety and quality symbol for certifying the products are in
compliance with the specified basic requirement of EU; and used for insure the consumers that the
products with this symbol are in conformity with the basic requirement of safety, health and
environment. CE is the abbreviation of the EU in Latin language, which also express the meaning of
conformity to the requirement of EU.
⒄Environment symbol certification: The materials applied in the production and the recycled are
given the conception of environment protection (such as the degradation time’s difference of the form
packaging and paper packaging and their recycle possibility).
⒅ISO9001 International Quality System Certification:
The evaluation and validation carried out by the third independent attestation agent or institute for
verifying the quality system of the plant is in conformity with the ISO 9000 standard, which includes
all aspects of the whole process, such as the product design, manufacture, test status, statistic
engineering, organization constructions etc., and also require the manufacturer to be in compliance
with the requirement of the standard and retain.
⒆ VDE:
A testing and certifying symbol, which can be obtained from the IEC System for Conformity Testing
and Certification of Electrical Equipment(CB).The test result of CB is approbated between 43 member
countries, and is also accepted by many other non-CB system countries.
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AUX air conditioner service manual
Section three
the basic structure of the air-conditioner
Air-conditioner is the kind of machine that performs the function of cooling and heating by utilizing
the heat-absorbing and heat-releasing consequence caused by the state variation of the refrigerant.
Although there are kinds of models, the working theory and the main structuring parts are basically
the same. Generally, the air-conditioner consists of the refrigerating system, electric control system
and air system etc., and each of them is composed of different parts. It’s necessary to know the
specific composition of the air-conditioner before learning it. In this case, we’d like to specify the
structure and performance of each parts of the air-conditioner as the following:
1. Refrigerating system parts
The main parts of the refrigerating system of the air-conditioner include: Compressor,
heat-exchanging unit (Condenser, evaporator), throttling unit (capillary tubes), brake & valve unit and
other auxiliary units. All of these units form a closed refrigerating cycle system after being connected
and jointed by copper pipes. The refrigerant stored inside the system complete the cooling and heating
cycle depending on the performance of the compressor.
The low-pressure refrigerant gas will be compressed by the compressor and turn into the high
temperature and pressure gas, and it will be cooled down and turn into the fluid again after passing
through the drying and filtering unit. Such fluid will flow through the capillary tubes and to be
throttled and cooled and finally inflood into the evaporator. Inside it, the fluid absorbs the quantity of
heat in the air and to be gasified. In this way, the indoor room air will be cooled down and to be
brought to the indoor room by the air-delivery system for further cooling down the indoor temperature,
then, the fluid refrigerant inside the evaporator will turn into gas again and will be absorbed by the
compressor repeatedly. Consequently by this way, the refrigerant keeps circulating between the units
of compressor-condenser-capillary tubes-evaporator continuously.
⑴Compressor
Compressor is the power core of the refrigerating cycle system in the air-conditioner. It realizes the
refrigeration purpose by the way of raising the temperature and pressure of the low temperature &
pressure refrigerant gas it absorbed after being compressed by the compressor and the consequent
conversion between the heat and power. In the air-conditioner, the structure of the compressor is
usually hermetic, and the electric motor, as the impulsion of the whole unit is airproofed inside a
container together with the compressor used for compressing the refrigerant, and the container is filled
with the lubricating oil as well as the corresponding lubricating agents mounted. The air compressors
of the air-conditioners are divided in three types: Reciprocating type, Rotary type and Scroll type.
①Reciprocating type
The Reciprocating type compressor mainly consists of cylinder, piston, crankshaft and connecting rod
agent. The crankshaft is powered and circumrotates by the electric motor, and push the piston to move
up and down inside the cylinder through the connecting rod. Once a cycle completed by the
compressor, the crankshaft will turn one round for undertaking the compressing, air discharge,
expansion and air absorbing process in turn. The compressor driven by the electric motor keeps
continuous running, and the piston runs repeatedly in the cylinder for finally realize the refrigerating
cycle. The practicality is as picture 2-1:
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AUX air conditioner service manual
② Rotary type
The electric motor of the Rotary type compressor is on its top, and the compressor is at the bottom.
The whole cylinder almost soaked in the freezing oil completely. The rotor inside the cylinder rolls on
the surface of the cylinder wall with the guide of the eccentric shaft. There is a through groove on the
surface of the cylinder wall, which contains a slide. The slide cooperates with the rotor precisely in the
groove and contacts the outer surrounding surface of the rotor tightly with the impact of the spring so
as to form a dynamic sealing. The dynamic sealing separates the space between the rotor and the
cylinder surface to be two parts, one is air inlet antrum, and the other one is compressing antrum.
During very rotation of the eccentric shaft, the air will enter inside the inletting antrum and meanwhile
the compressing antrum will complete the compressing and the ejecting process accordingly. The main
impress of the rotary compressor is a liquid-gas separator (Liquid receiver) attached to the side of the
compressor. Please refer to picture 2-2;
③Liquid-gas separator (Liquid receiver)
In case of the liquid impact caused by the direct entry of the liquid refrigerant to the compressor, the
liquid-gas separator is mounted between the evaporator and the compressor of the air-conditioner. The
function of the separator is not only a separation of the gas and liquid refrigerant, but also a storage for
additional liquid refrigerant produced in the refrigerating cycle. It can automatically adjust the
supplying quantity of refrigerant liquid according to the load variety for avoiding the compressor’s
liquid compression. With this function, the gas & liquid separator is also called Liquid receiver.
The common gas & liquid separator (Refer to Picture 2-3) consists of the cylinder, air-inlet pipe and
“U” air-vent pipe etc. There is an oil-sucking hole at the bottom of the “U” pipe. When the compressor
working, the gas and liquid refrigerant come from the evaporator will flow into the gas & liquid
separator. The liquid refrigerant falls into the bottom of the cylinder because of gravitation, only the
gas refrigerant will be sucked into the compressor. The liquid refrigerant at the bottom of sleeve can
only be allowed after being boiled gasified by absorbing heat. The refrigeration oil at the bottom of
the cylinder, after being separated from the liquid refrigerant and being located at the above of the
liquid, will be absorbed by the compressor by passing through the oil-sucking hole together with the
gas. When the compressor stops working, the pressure-balancing hole can prevent the redundant
refrigerant of the separator’s flowing into the compressor through the oil-sucking hole. This type gas
& liquid separator are popularly applied in the heat pump model air-conditioner with To-and-fro type
compressor. It can prevent the liquid refrigerant being brought into the compressor at the moment of
exchange between heating and refrigeration process.
The structure of the Rotary type separator is as the picture 2-4. It’s mainly composed by the straight
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AUX air conditioner service manual
air-inlet pipe, “J” air-vent pipe and the pole sleeve. There is no connection between two pipes. The
separator is connected with the compressor by the air-inlet pipe. The filter net at the entrance of the
separator has the function of gas & liquid separating, noisy eliminating and filtering. Passing through
the air-inlet pipe, the refrigerant from the evaporator flows into the separator. Therein, the liquid
refrigerant that passing through the filter net falls to the bottom of the sleeve, and will climb to the
upper of the air-vent pipe until being absorbed by the compressor after being gasified in case of liquid
compression impact to the compressor.
④Heat exchanger
The evaporator and the condenser are called heat exchanger. The evaporator gasify and evaporates the
liquid refrigerant so as to absorb the heat from outside; on the contrary, the condenser releases the heat
to outside so as to low down the temperature of the gas refrigerant and liquefy it. To Cooling only
model air-conditioner, the indoor heat exchanger is evaporator and the outdoor heat exchanger is
condenser. There are two sets of heat exchanger configured in the Heat pump air-conditioner, one is
indoor type, and the other one is outdoor type, both of them are with different function because of the
different direction of their flowing circulations. During cooling mode, the indoor heat exchanger acts
as the evaporator and the outdoor heat exchanger acts as the condenser; during heating mode, indoor
heat exchanger acts as the condenser and the outdoor heat exchanger acts as the evaporator.
The indoor and outdoor heat exchangers are in the configuration of wing coil type mostly. For
promoting the efficiency of heat exchange, the patches of aluminum alloy wings are usually punched
in kinds of shapes so as to enlarge the heat exchange area, for example of Picture 2-5.
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AUX air conditioner service manual
a) Evaporator:
Evaporator is also called cooler. It is the apparatus used for direct cooling purpose in the refrigerating
cycle and is usually installed inside the indoor unit. The evaporator applied in the air-conditioner is the
wing coil type with high heat transmission coefficient and compact structure. The liquid refrigerant
flows into the snake copper pipe after the throttle of the capillary tubes. The air around the outside of
the copper pipe is the floating air by force. When the compressor works, the wing coil will absorb the
quantity of heat from the indoor air so as to have the liquid refrigerant gasified and bring away the
quantity of heat for cooling the room temperature. Meanwhile, it can also freeze the surrounding air of
the evaporator until its temperature reaches the dew point to get rid of the moisture and humidity of
the air.
Due to the continuous production for condensing water between the wings of the evaporator, the
distance between the wings is usually required to be enlarged enough (comparing with the one of
condenser) for insuring the air’s free flow. In addition, the hydrophilic aluminum foil is generally
applied for the wing of the evaporator so as to reduce the surface tensile force of the condensing water
and quicken the water flowing speed and consequently accelerate the air flowing speed.
b) Condenser
Condenser liquefies the high temperature and pressure gas refrigerant delivered from the compressor.
The structure of the condenser in the air-conditioner is basically same as the one of evaporator. When
the compressor works, the high temperature and pressure gas refrigerant ejected from the compressor
enters into the copper pipe of the condenser through the air-inlet mouth, and turns into the liquid after
the heat exchange process undertaken by the outside wings. The condenser usually chooses the air as
its cooling medium. However, due to the low heat transmission coefficient of the air, the wings on the
copper pipes are used for enlarging the heat exchange area with the air, and the heat transmission
ability is also enhanced by the blast of the outdoor fan. To the split type air-conditioner, condenser is
assembled and located in the outdoor unit together with the compressor.
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For the purpose of enhancing the heat exchange coefficient of the condenser, the number of the wings
can be increased or the interval distance between the wings can be shortened. Because there is no
condensing water being produced by the wings of the condenser, and there is no much air resistance as
the evaporator faces, the distance between the wings can be shortened accordingly. The quantity of
heat transferred by the condenser is equal to the sum of the one absorbed by the indoor evaporator and
the one occurred during the operation of the compressor. The area of the surface to the common
condenser is usually larger than the one of the evaporator in order to promoting cooling capacity for
the room.
⑸The throttling component
The refrigerant in the refrigerating system of the air-conditioner has the need for maintaining a certain
evaporating and condensing pressure in order to absorb and release the quantity of heat and realize the
circulation of the system. The throttling component is the one in controlling the refrigerant and
maintains a certain flux. It is the device used in the refrigerating system cycle for accommodating the
flux of the refrigerant. It can have the temperature and pressure of the liquid refrigerant at middle
temperature and high pressure coming from the condenser dropped, and then send them to the
evaporator for obtaining the more evaporating temperature and pressure.
The air-conditioners in different specification have different capacity So, the throttling component in
controlling the different flux shall be different. The throttling component type in the general
air-conditioner includes the capillary tubes type and expansion valve type. But only capillary tubes
applied in the home use air-conditioner because of the small flux it is. The following is the detailed
introduction for it.
The capillary tube is a slim and long copper pipe with a small aperture. The inner diameter of it is
1mm—2mm, and the length is 500mm—1000mm. With the properties of simple structure, easy
machining, low cost and reliability, especially enough capability for the throttling need at a stable
indoor room temperature; it’s popularly applied in the practice. However, it has a weak
accommodating function, which can be workable under a rating working status but can’t adjust the
flux following with the variety of the load of the refrigeration system.
The capillary tube is a kind of throttling component applied in the refrigeration system. It is welded
between the condenser and the evaporator for the function of reducing pressure and throttling flux. It
can prevent the liquefied refrigerant at a normal temperature and pressure of the condenser entering
into the evaporator directly so as to reduce the pressure of the evaporator in favor of the evaporation
of the refrigerant. After stopping the operation of the compressor, it can maintain a balance between
the low-pressure part and the high-pressure part for the convenient re-start of the compressor. The
resistance will be reduced and the flux of the refrigerant will be increased if enlarging the inner
diameter or shortening the length of the capillary tubes, and on the contrary if otherwise. The capillary
tubes must match the refrigerating devices and cannot be replaced freely, especially when the inner
diameter, the roughness of the inner surface and the length are in difference, it may affect the normal
operation of the refrigeration system badly. As the narrowest part of the refrigeration system, the
capillary tubes may easily to be jammed. The figuration of the capillary tubes is indicated in the
picture 2-6 as the below.
⑹Liquid distributor
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AUX air conditioner service manual
To the air-conditioner with a large evaporating surface area, usually, the coil pipes of the evaporator
are ranked together side by side. For enhancing the evaporation efficiency, the liquid distributor is in
need to be assembled for having the refrigerant enter into the evaporator equably in various routes.
The liquid distributor of the air-conditioner generally consists of a coniform unit body and a throttling
nozzle. The refrigerant enters inside through the nozzle and to be guided in different ways following
the inner surface of the cone. There are many equally distributed holes at the bottom of the cone,
which are connected to the various accesses of the evaporator through the capillary tubes. When the
refrigerant flows through the nozzle of the throttling liquid distributor, its flow speed will be
accelerated due to the sudden contraction to the section area of the stream, and force the liquid and gas
mix together equally to flow into the capillary tubes which connect to the throttling ring. Consequently,
the flows will enter inside the various tubes of the evaporator so as to enhance the evaporating
efficiency for the evaporator. Refer to the below picture 2-7 of the figure of liquor separator.
⑺The stop valve
For controlling the braking of the refrigerant existing in the pipes of the refrigeration system, and
switching its flowing direction for the purpose of switching the heating and refrigerating function of
the air-conditioner as well as easy service operation, there are various types stop valve units are
amounted in the pipelines of the air-conditioner’s refrigeration system. The most important includes
the electromagnetic reversing valve, single direction valve and cut-off valve etc.
①the electromagnetic reversing valve it’s mainly applied in the heat pump air-conditioner. Since there
are four main pipelines connect to it regarding to the structure, it is usually called four-way valve. It is
used to changes the function of the condenser and evaporator and realize the shift between the
air-conditioner’s functions of refrigerating, heating or defrosting etc. through the way of changing the
direction of the flow of the refrigerant in the system. Refer to the below picture 2-8 for the figure of
the electromagnetic reversing valve.
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AUX air conditioner service manual
The electromagnetic reversing valve consists of two parts. One is the solenoid guiding valve; the other
one is four- way commutating valve. The solenoid guiding valve usually controls the four-way valve
by three guiding capillary tubes. The structure is as the above picture:
From the picture, we can see the solenoid guiding valve consists of the valve bowl, spring, iron core
and electromagnetic loop, there are four valve bores on the valve body connecting with the guide
capillary tubes. When the loop is not electrified, the iron core and the valve bowl move left by the
thrust of the spring. At this moment, capillary tube d and c are contacted (in high pressure), capillary
tube a and b are connected (in low pressure), thereby drive the slide of the four- way valve to move
left, and the four-way valve E will be connected with S, D will be connected with C。 When the loop
of the solenoid guiding valve is electrified, the solenoid field magnetizes the gag bit move right side,
and compress the spring for forcing the iron core and the valve bowl move right. At this moment,
capillary tube a and d are contacted (in high pressure), capillary tube b and c are connected (in low
pressure), thereby drive the slide of the four-way valve to move right, and the four-way valve D will
be connected with E, C will be connected with S.
The four-way valve consists of the valve body and four connecting pipes. The connecting pipes are
connected separately with the air-inlet and air-outlet tube of the compressor as well as the indoor and
outdoor heat exchangers. There are semicircle slide and two pistons with holes in the valve body.
Acting as the valve, the slides move horizontally inside the valve body, and have the two connecting
pipes at the bottom of the valve body to be connected through the two valve holes being covered by
the slide. The other connecting pipe at the bottom connects with the valve body through another
valve hole. The piston and the slide connect together by the valve bracket and move together in
synchronization.
When the air-conditioner runs the cooling mode, the electricity current to the loop of the solenoid
valve shuts off and the iron core drives the valve bowl to move left. Then the capillary tube d connects
to c (in high pressure) and a connects to b (in low pressure). Because the capillaries c and d connect
with the discharge pipe of compressor, they will form a high-pressure zone being filled with the
high-pressure gas. However the capillaries a and b connect with the suction pipe of the compressor,
they will form a low-pressure zone. At this moment, the piston moves to the left side by the pressure
difference, then, D connects to C, the high-pressure gas refrigerant in D pipe flows into the outdoor
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AUX air conditioner service manual
heat exchanger (as condenser) for heat transmission process passing through pipe C, and enters into
the indoor heat-exchanger (evaporator) passing through capillary tube. Finally, it will enter into pipe S
from pipe E and return back to the compressor for concluding a refrigerating cycle. The flow process
is indicated in Chart 1:
When the air-conditioner runs the heating mode, the loop of the solenoid guiding valve is electrified
and the iron core drives the valve bowl to move right. Then the capillary tube a connects to d (in high
pressure) and b connects to c (in low pressure). Because the capillaries a and d connect with the
discharge pipe of compressor, they will form a high-pressure zone being filled with the high-pressure
gas. However the capillaries b and c connect with the suction pipe of the compressor, they will form a
low-pressure zone. At this moment, the piston moves to the right side by pressure, then, D connects to
E, the high-pressure gas refrigerant in D pipe flows into the indoor heat exchanger (as condenser) for
heat transmission process passing through pipe E, and enters into the outdoor heat-exchanger
(evaporator) passing through capillary tube. Finally, it will enter into pipe S from pipe C and return
back to the compressor for concluding a heating cycle. The flow process is indicated in Chart 2:
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AUX air conditioner service manual
②one-way Valve
Check valve is also called anti-reverse valve. it permits the refrigerant to flow in only one direction in
the refrigeration system, and to be installed in the pipes for preventing process flow from
reversing. It is mainly applied in the heat pump air-conditioner and adopted as the assistant to the
electromagnetic reversing valve for changing the refrigerant’s flow direction and the system’s pressure.
Generally, there is an arrow marked on the outer surface of the one-way valve for indicating the flow
direction of the refrigerant.
The one-way valve is divided into the spherical valve and the needle valve. They are in the simple
structure. For example in the below picture, when the refrigerant flows in the direction as the arrow
indicates and when the pressure at A side is higher than the one at B side, then the steel ball (or valve
needle) moves to the left side, and the refrigerant flows from A to B, the one-way valve opens.
However, when the refrigerant flows in a reverse direction and when the pressure at B side is higher
than the one at A side, then the steel ball (or valve needle) moves to the right side, which jams the
refrigerant’s flow route, and the one-way valve is in close status.
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AUX air conditioner service manual
It’s not reliable to rely on the electromagnetic reversing valve only for controlling the flow direction
of the refrigerant due to great disparity existing in the working conditions between the cooling and
heating modes of the heat pump air conditioner. Hence, the one-way valve is always applied in the
heat pump air-conditioner in order to switch the refrigerant’s flow directions safely and effectively as
shown in picture 2-11：
In the process of cooling cycle, the difference between the high pressure and the low pressure is small,
the main capillary tube is throttling component, and the auxiliary capillary is short circuited by the
check valve; In heating cycle, the check valve in parallel connection with the auxiliary capillary tubes
is cut off, the refrigerant will flow through the auxiliary capillary, then the throttling components are
the combination of the main capillary tubes and the auxiliary capillary tubes so as to strengthen the
resistance of the throttling component, enlarge the difference between the high pressure and low
pressure of the cycle, reduce the refrigerant temperature of the outdoor heat-exchanger for obtaining
more quantity of heat from outside and achieving the heating purpose.
⑻ Stop valve
In consideration of the convenient installation and service, there are two cut-off valves connecting
separately to the joint entry of the gas tube and liquid tube of the outdoor unit of the split type
air-conditioner. The cut-off valve is a kind of close valve for pipeline. It controls the pass and stop of
the refrigerant flow by manual open-close control valve core. The cut-off valve can be divided into the
two-way cut-off valve and three-way cut-off valve according to the structure difference.
① Two-way cut-off valve
Two direction cut-off valve is used to be installed at the side of the liquid tube, which is belonging to
the tubing of the outdoor unit. The practicality is as picture2-12. The two direction cut-off valve
consists of the position regulator entry and two vertical cross pipelines. The configuration shown in
the picture 2-13 indicates: One of the pipelines connects with the liquid tube side of the outdoor unit,
the other one connects with the tubing of the indoor unit through the connecting tube of the indoor and
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AUX air conditioner service manual
outdoor units. Inside the position regulator entry, there are valve rod and valve hole seat. A graphite
cotton rope (or oil-proof rubber) sealing ring is fixed at the middle position of the valve rod and
impacts the valve rod by the force of the fastening screw so as to prevent the gas leaking from the
valve rod. Before inspection or installation, screw off the copper enveloping cap, and screw off the
fastening screw of the valve rod by the inner hexagonal spanner. The attention herein is: If screw off
in clockwise direction, the valve rod moves down and the valve hole closes, otherwise, the valve hole
opens and the two vertical pipelines get through together.
② Three-way stop valve
In addition to all the above functions of two direction cut-off valve, the three direction cut-off valve
owns an extra service entry that provides the convenience for air-conditioner’s inspection and service.
The tree direction cut-off valve is installed on the gas tube’s joint entry of the outdoor unit. It’s in a
right-angle shape. Despite of two pipes’ joint entry and one valve rod position regulator entry, there is
an additional service entry. The practicality is as the picture 2-14.
The common three direction cut-off valve is equipped with a valve core, and composed with two
pipeline s’ joint entry, one regulating entry and one service entry. The four entries are straight as the
structure indicated in picture 2-15. The valve core inside the service entry is used for sealing the entry
and shall be covered by the dust-proof copper screw cap. When the valve rod moves down to the close
position, the tube breaks off from the pipeline of outdoor unit; On the contrary, when the valve rod is
screwed off upward to the open position, two connecting tubes get through together and the outdoor
unit get through with the indoor unit consequently. When fill in the refrigerant after service, press
down the valve core, and the service entry always keep through with the tubing without concerning
whether the valve rod is ON or OFF.
⑼Pressure switch
The pressure switch of the air-conditioner is a kind of on-off component that transforms the pressure
signal to be the electricity signal so as to control the air-conditioner. It provides a safety protection to
the operation of air-conditioner. When installation, fix the pressure switch on the pipeline that in need
of supervision and control. The switch’s contact points are in series connected with the main
controlling loop through the lead cables for controlling the on-off of the compressor. The pressure
exerted by the motion of the switch is already fixed on the production line without further adjustment
in application period. When the pressure inside the pipeline is abnormal (too high or too low), the
flexible film flake will react and regulate the scale of pressure inside the pipeline by separating the
standing closed electric contact points through mandril and cut off the controlling circuit.
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AUX air conditioner service manual
The pressure switch used for the air-conditioner includes two types: high pressure switch and low
pressure switch. They are composed of the screw joint entry, thin shell film flake, dynamic contact
point, static contact point and mandril etc. Such as the picture 2-16：
The high pressure switch is fixed at the high pressure side of the refrigerating system. It shuts off the
main controlling circuit of the air-conditioner and stops the operation of the compressor in the event of:
the dust accumulation on the condenser’s wing blocks the air path, or the fan is damaged and the air
volume is insufficient, or the refrigerant is overcharged, or the air inside the system causes the
over-high pressure inside the pipeline. It will restart automatically after the pressure drops.
The low pressure switch is fixed at the low pressure side of the refrigerating system. It shuts off the
main controlling circuit and stops the operation of the air-conditioner for protecting the compressor in
the event of: the dust covers the evaporator’s wing, or the fan air volume is insufficient, or the
refrigerant is insufficient, or the surface of the evaporator is frosted, or the system is blocked, etc.,
which may cause the low air-sucking pressure at the low pressure side.
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AUX air conditioner service manual
⑽The other parts:
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AUX air conditioner service manual
Chapter 2
Section one
Introduction of AUX products
the basic functions introduction of Electric controller
Ⅰ.The characteristics of the appearance and structure
1. The appearance photos of the outdoor unit
outdoor unit 1
outdoor unit 2
outdoor unit 3
2. The appearance photos of the remote controller (applicable for Model 9000BTU~24000BTU )
YK(R)-F/001E( YKR-F/002E )
YK(R)-C/02JE
YK(R)-C/01E
Ⅱ.The basic function introduction of the split wall-mounted type Electric-controller
(9000BTU~12000BTU):
1. The basic conditions for the operation of the controller
⑴The applicable voltage range of the electrical power: The input voltage 103 V – 130V;
⑵The input AC current frequency: 60Hz；
⑶The operating temperature for electric controller: （-10~+70）℃;
⑷The operating moisture for electric controller: RH20%~RH90%;
⑸The indoor fan: RP plastic-sealed motor, three impulse feedback signal;
⑹The outdoor fan: tap iron-shell motor, only one speed range and the normal working current shall be
lower than 1.5A;
⑺The normal working current of the four-way valve: lower than 1.9A/115VAC;
⑻The Swing Motor: DC12V, Four phase eight step stepping motor;
⑼Compressor: Single-phase power supply, the normal working current shall less than 15A.
2. Functions of the electric controller
The function of the controller consists of the following parts:
⑴The remote control receiving function;
⑵LED/ Digital displaying function;
⑶Force operation function;
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AUX air conditioner service manual
⑷The air vane’s automatic swing function and the position setting function;
⑸The buzzer’s driving function;
⑹The indoor fan’s driving function;
⑺The timing on-off function;
⑻The compressor restarting protection function;
⑼The indoor heat-exchanger overheating protection function under heating mode;
⑽The automatic defrosting and resume function under heating mode;
⑾The anti-cold air function under heating mode;
⑿The anti-freezing function under cooling and defrosting modes;
⒀Self-detecting function.
3. The main functions specification
⑴ The specialty terms and their express:
TA: Stands for the indoor ambiance temperature;
TE: Stands for the indoor evaporator temperature;
TS: Stands for the setting temperature;
⑵ Emergency switch
①The air-conditioner turns off if press on this button when the air-conditioner is working; The
air-conditioner turns on if press on this button when the air-conditioner is off, and it will work in an
automatic mode after press on this button. Then the indication light twinkles for 20 seconds and the
air-conditioner does not start working until the working mode to be selected by the system;
The air-conditioner automatically selects one of cooling, dehumidification, and heating mode as the
working mode according to the indoor air temperature.
a) When TA≥TA1, the controller enters into the cooling mode and follows the mode in working. The
setting temperature herein is 24℃ and the setting wind speed is strong wind;
b) When TA2<TA<TA1, the controller enters into the dehumidification mode and follows the mode in
working. The setting temperature is 24℃ and the setting wind speed is strong wind;
c) When TA≤TA2, the controller enters into the heating mode and follows the mode in working (The
cooling only type follows the ventilation mode). The setting temperature herein is 24℃ and the setting
wind speed is strong wind;
d) This mode includes the functions of timing, sleeping, /auto-restart (optional), negative ion
(optional), I feel（optional）; The system mode will not change along with the variety of the indoor
temperature after being selected. The default status of the horizontal air-blade is still. The operation
can be adjustable by receiving the remote signal.
② Press this emergency-switch without release at least 5 seconds until the ring of the buzzer rings
twice. The controller enters into the trial operation. The trial operation time is 30min:
a) The sensor of the air-inlet temperature doesn’t function in the period of trial operation. The
compressor starts work after 3min delay protection (The primary running has no 3min safety-guard
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AUX air conditioner service manual
protection), the wind speed of the indoor fan is high wind, the running mode is cooling mode, and the
wind door is maximum opening.
b) There are no anti-freezing protection and high temperature-preventing protection during trial
operation.
⑶Automatic run mode
When controller select an automatic working mode, the indication light twinkles for 20 seconds and
the air-conditioner does not start working until the working mode to be selected by the system; The
air-conditioner automatically selects one of the cooling, dehumidification, and heating mode as the
working mode according to the indoor air temperature .
① When TA≥TA1, the controller enters into the cooling mode and follows the mode in working. The
setting temperature herein is 24℃ and the air-conditioner runs according to the setting wind speed;
② When TA2<TA<TA1, the controller enters into the dehumidification mode and follows the mode
in working. The setting temperature is 24℃ and the air-conditioner runs according to the setting
wind speed;
③ When TA≤TA2, the controller enters into the heating mode and follows the mode in working (The
cooling only type follows the ventilation mode). The setting temperature herein is 24℃ and the
air-conditioner runs according to the setting wind speed;
④ This mode includes the functions of timing, sleeping, auto-restart (optional), negative ion
(optional), I feel（optional）;
⑤The system mode will not change along with the variety of the indoor temperature after being
selected. The new working mode will be selected again after air-conditioner turns off or mode switch.
⑷Cooling mode
The setting temperature shall be set by the remote control. The temperature controlling range is 16℃ 32℃. The setting temperature can be adjusted through the button of “+” “-”. The setting wind speed
can be adjusted through the button of “wind speed selection” in the selection of the four wind speed
types, such as strong wind, high wind, low wind and mute wind. The four-way valve always be closed
under this mode. The other action is as following:
① When TA - TS≥1℃，after the compressor meet the 3 minutes delay protection, the compressor and
the outdoor fan start running;
② When TA = TS，maintain the previous status;
③ When TA - TS≤-1℃，after the compressor meet the 3 minutes protection condition, the compressor
and the outdoor fan turn off;
④ The setting wind speed can be adjusted by the remote control during the ongoing cooling process,
and the interior fan still retains working;
⑤ When the status of TE ≤ TE1 last for 10 seconds and the compressor keeps working for above
than 5 minutes, turn off the compressor and outdoor fan, the indoor fan keep working according to the
setting wind speed; quit from such protection if TE≥ 7℃;
⑥ This mode includes the functions of timing, sleeping, auto-restart (optional), negative ion
(optional), I feel（optional）;
⑦ When the cooling ongoing，the button of the “Swing” can control the swing and stop of the
horizontal air-blade;
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AUX air conditioner service manual
⑧Automatic wind-speed control：
TA - TS≥3℃，wind-speed works in high wind;
TS +1℃≤TA＜TS +3℃，wind-speed works in middle wind;
TA – TS＜1℃，wind-speed works in low wind;
Without 3 minutes delay when the wind speed turns from the high wind from the low wind, otherwise
with 3 minutes delay;
⑨Being initially electrified, the compressor doesn’t have the 3 minutes extension/delay protection,
the outdoor fan starts after 2 seconds of the compressor’s start; TS＞TA set by the remote control, the
compressor turns off immediately with no need of 3 minutes delay protection;
⑸Dehumidification mode
①The four-way valve always turns off when the dehumidification mode is ongoing. The control range
of the temperature is: 16℃ - 32℃.
②Under the dehumidification mode, after the 3 minutes protection conditions being meet
satisfactorily, the performance of the compressor and the outdoor fan is as following:
a)TA ≥ TS+2℃，the compressor and the outdoor fan works continuously, the wind speed retains the
setting wind speed;
b)TS ≤ TA < TS+2℃，the compressor and the outdoor fan runs for 10minutes and stops for
6minutes，The indoor fan turns off during the compressor’s 3 minutes stopping period and keeps on
working in breeze mode under other conditions;
c)TA < TS，the compressor and the outdoor fan stop working, and the indoor fan start to work in
breeze mode after stopping for 3 minutes；
Automatic wind-speed control：
TA - TS≥5℃，the wind speed is on high wind;
TS +3℃≤TA＜TS +5℃，the wind speed is on middle wind;
TS +2℃≤TA＜TS +3℃，the wind speed is on low wind;
TS≤TA＜TS +2℃，the wind speed is on fitful breeze;
TA＜TS，the indoor fan is off during the 3 minutes delay of the compressor, and 3 minutes later,
the wind is at breeze speed.
③The primary electrifying to compressor has no 3 minutes protection delay, the outdoor fan starts 2
seconds later after the start of the compressor;
④When the indoor fan runs, the horizontal air-blade can be set as free swing, and the swing condition
is same as the one under cooling mode；
⑤When TE ≤ TE1 last for 10seconds and the compressor runs continuously for above 5minutes，if
turn off the compressor and outdoor fan, the indoor fan runs at the setting wind speed; If TE ≥ 7℃，
quit the protection；
⑥This mode includes the functions of timing, sleeping, auto-restart (optional), negative ion (optional),
I feel（optional）.
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AUX air conditioner service manual
⑹Ventilation mode
Under ventilation mode, the outdoor unit is always off, and the indoor fan runs according to the
default wind-speed. The remote control can be set with three types wind-speed, e.g. high fan, low fan
and silent fan except the strong fan; The operation condition of the air door is same as the one under
the refrigeration mode; The mode includes the function of timing, auto-restart (optional), negative ion
(optional), I feel（optional）.
⑺Heating mode
The default temperature is determined by the remote control and to be within the range of 16℃ - 32℃,
which can be adjusted by the button of “+” and “-”. Press the button of “fan speed selection” for
choosing the wind speed from the four gears of strong fan, high fan, low fan and mute fan. The other
conditions are as following, when:
①TA-3-TS≤-1℃，if after three minutes delay time as for protection purpose, the compressor and the
outdoor fan start, the indoor fan works in cold-wind prevention condition, the TA shown on the digital
display has 3℃ temperature compensation.
②TA-3-TS≥1℃，if the compressor last continuously running for 3minutes, the compressor and the
outdoor fan stop, the indoor fan keeps on working under anti cold-wind condition. The TA shown on
the digital display has 3℃ temperature compensation.
③TA-3=TS，retain the previous status；
④Automatic wind speed control, when:
TA ＜ TS，wind speed in high fan；
TS ≤ TA＜TS +2℃，wind speed in middle fan；
TA ≥ TS + 2℃，wind speed in low fan；
When wind speed turns from the low fan to high fan without 3 minutes protection delay; wind speed
turns from the high fan to low fan with 3 minutes protection delay；
⑤When the heating process is ongoing, the button of the “Swing” can control and stop the swing
leaves; When swing works freely, the maximum angle of the swing leaves is 50°e.g. the swinging
status between 3-5 (refer to picture 3);
⑥There is no 3 minutes’ delay protection for electrifying the compressor initially. The compressor
starts 10 seconds later after the start of the four-way valve. The outdoor fan starts 2 seconds later after
the start of the compressor; Low down TS to be ＜TA-3，then the compressor turns off immediately
without the restriction condition of 3 minutes protection delay;
⑦The mode includes the functions of timing, sleeping, auto-restart (optional), negative ion (optional),
I feel（optional）
⑧The four-way valve starts immediately once being electrified.10 seconds later the compressor starts;
Under the compressor opening condition, the four-way valve shuts off after 2 minutes and 50 seconds
delay protection when turn off or switch the controller; The four-way valve turns off immediately after
turning off the controller when the compressor is off;
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AUX air conditioner service manual
⑨Anti cold-wind and Residual-heat Removing function:
TE controls the wind speed of the indoor fan, and the specific conditions are as below:
●The anti cold-wind status when the compressor runs:
a) When TE in rise status and at the moment of TE＜TE1，the indoor fan turns off；TE2≤TE＜TE3，
the indoor fan blows the breeze; TE3≤TE＜TE4，the indoor fan blows the mute wind; TE≥TE4，the
indoor fan blows the set wind speed;
b)When TE in fall status and at the moment of TE＞TE5，the indoor fan blows the set wind speed;
TE6＜TE≤TE5，the indoor fan blows the mute wind；TE7＜TE≤TE6，the indoor fan blows the
breeze；TE≤TE7，the indoor fan turns off.
●The anti cold-wind status when the compressor stops working:
a）When TE is in fall status and at the moment of TE＞TE2，the indoor fan blows breeze；at the
moment of TE≤TE2，indoor fan turns off；
b）When TE is in rise status and at the moment of TE≥TE6，the indoor fan blows breeze；at the
moment of TE＜TE6，indoor fan turns off；
●The residual-heat Removing function：
When TE＞TE8，the indoor fan runs in breeze，if ≤TE8，the indoor fan stops working, and the time in
removing residual heat ≤10seconds，Within the 10 seconds of residual heat removing, if TE< TE8, the
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AUX air conditioner service manual
indoor fan stops immediately.
⑩Overheated protection：
a)When heating function runs，if TE≥TE9 and last for 10seconds，the outdoor fan stops；if TE≥TE10
and last for 10seconds, then stop the compressor；When TE< TE11 and after the 3 minutes protection
delay, the compressor resumes normal working.
b）.This temperature protection is valid only when the TE temperature sensor runs normally.
⑻The auxiliary electric heating function
①The electric heating function may not start unless the heating mode runs normally e.g. the
compressor starts, the outdoor fan runs, the four-way valve is electrified, the indoor fan is on as well
as the availability of the below conditions:
a)TE < TE12；
b)TA < TA3；
c)TS – TA ≥ 3℃；
d)The compressor runs continuously in heating mode for 4min；
②The auxiliary electric heating may withdraw working if meet one of the below conditions:
a)TA > TA3；
b)TS – TA < 2℃；
c)TE > TE11；
③If one of the compressor, four-way valve and indoor fan doesn’t work or there is error feedback
from the indoor fan, the auxiliary electric heating withdraw from work;
④If the sensor of TE is damaged and the turn-off without non-electricity occurred in the ongoing
auxiliary electric heating process, the indoor fan turns in the low speed wind operation for 40 seconds
and stops；
⑼ Intelligent defrosting function
①Under the operation of the intelligent defrosting mode, the air-conditioner starts the defrosting
process if satisfying the requirement of one of the below five conditions (the sub-conditions included
shall all be satisfied). During the defrosting process, the sleeping light is twinkling:
● a) The outdoor fan starts the overloading protection and the outdoor fan stops;
b) Restart the outdoor fan after stop and the continuous running time over than 10 minutes;
c)The accumulated operation time of the compressor ≥45min；
d)The continuous operation time of the compressor≥20min；
e)TE ≤ TE12。
● a) After the 5 minutes operation of the heating mode or 5 minutes later after the defrosting process,
starts the capture motion for the max. difference value between TE and TA, when the difference
between TE and TA being reduced up than X min and the time lasts≥3min；
b)The continuous operation time of the compressor≥5min；
c)The accumulated operation time of the compressor≥45min；
d)TE ≤ TE12；
Note：When the wind speed correction available, if the wind speed of the indoor fan drops by one gear,
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AUX air conditioner service manual
the temperature difference correction value shall be -1℃，if the wind speed of the indoor fan rises by
one gear, the temperature difference correction value shall be +1℃.
● a)The accumulated operation time of the compressor≥3hour；
b)The continuous operation time of the compressor≥20 minutes；
c) The difference value between TE and TA less than Y℃.
● a）The difference value between TE and TA less than Y℃ and continuously last for 5minutes；
b)The accumulated operation time of the compressor is over than 45minutes；
c)The continuous operation time of the compressor is over than 20minutes；
The air-conditioner starts the defrosting process if satisfying the conditions, and records the TE value
then before defrosting starts. Compare the TE value after defrosting with the one before defrosting, if
the value of the later is not 3℃ more than the former one, it will not start the defrosting process
according to this condition until the mode conversed and the air-conditioner to be restarted for heating
or after another defrosting process;
●The air-conditioner starts time counting after overheating protection delay (the outdoor fan stops)
and starts an force defrosting process two hours later.
②The intelligent defrosting process quit if satisfying one of the below four conditions:
a)The duration of the intelligent defrosting process≥9min；
b)After the 4 minutes defrosting process，if TE≥0℃ and the TE rise by 2℃ within 10seconds；
c)After the 5 minutes defrosting process，if TE≥5℃；
d)Test the current of the compressor 1 minute later after compressor starts, When the current of the
compressor ≥6A（3.2Kw、3.5Kw wall-mounted unit require the current of the compressor≥8A）and
continuous lasts for 5 seconds.
⑽The sleeping control function
①The sleeping control function is valid during the automatic, cooling, dehumidifying and heating
mode. The wind speed of the indoor fan falls by one gear after starts the sleeping control function and
the sleeping indication lamp on;
②Press the button of “sleeping” and start the sleeping process. The default temperature rises by 1℃ to
the ongoing cooling mode after 1 hour running; the default temperature falls by 2℃ to the ongoing
heating mode after 1 hour running; after another 1 hour running, the default temperature for the
ongoing cooling process rises by 1℃ and falls by 2℃ for the ongoing heating process. The sleeping
process last for 7 hours until power-off.
③The modes switch function is still valid after enter into the sleeping process, but will quit after
modes switched. The air-conditioner runs at the temperature value of “new default temperature +
correction temperature” if press the button of temperature “+”.
④Under the sleeping status, press the button of “sleeping” again or press the modes option and on-off
button to quit sleeping function and end the sleeping process.
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The sleeping process under cooling mode:
Setting temperature
rises another 1℃
rises 1℃
Previous Setting
temperature
1h
2h
7h（end sleeping process，turn off）
The sleeping process under heating mode:
Setting temperature
Previous setting
temperature
falls 2℃
Falls another 2℃
1h
2h
7h（end sleeping process，turn off）
⑾Timing control function
①The longest Timing time is 24 hour and to be counted per minute, single timing method，
the timing function will not be cancelled due to the modes changed, and the timing indication
light on after completing the timing setting.
②Timing power-off：The timing power-off function can be set only under the working condition of
the air-conditioner. The timing range is 1min-24h，and the air-conditioner turns off automatically once
the time is over.
③Timing power-on：The timing power-on function can be set only under the working condition of the
air-conditioner. The timing range is 1min-24h，and the air-conditioner turns on automatically once
reaching the time.
④The restart and power-off motions happen after completion of the Timing setting will cause the
automatic cancellation of the previous timing and sleeping setting function.
⑿Self-detecting function
Press the Emergency button and electrify the air-conditioner, the self-detecting process starts
after twice short buzz from buzzer:
Start the electric heating, run the indoor fan at a high fan speed, open the air door to be the
maximum Æthe digital display and three indicating light on in 1 secondÆ digital displays
“11”、“22”、“33”、“44” in turn and 1second for each of them ÆRun light on 1 second ÆTimer
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AUX air conditioner service manual
light on 1 second ÆSleep light on 1 second ÆEach phase of the stepping motor’s motion in 1
second Æthe indoor fan runs for 1 second at low fan speed and middle fan speed
separatelyÆthe compressor’s motion for 1 second ÆThe four-way valve’s motion for 1
second ÆOutdoor fan’s motion for 1 second ÆNegative generator’s motion for 1 second
Æbuzzer deliver one short toneÆElectric heating runs 30 Seconds and stops, then the air
conditioner turns into waiting status, the self-detecting function ends.
⒀Fault indication
When there is faults happen to the air-conditioner, the Timer lights on. The control light panel will
indicate the corresponding fault codes, which are specified as the following:
FAULT
Digital Display
“E4”
Phenomenon
AC stopped
PG
abnormity
TA
“E1”
AC stopped
abnormity
TE
“E3”
AC stopped
abnormity
After the indoor motor electrified, if there is no impulse signal feedback by the indoor motor
detected within 10 seconds, cut off the output voltage supplied to the indoor fan from the
controller. After 30seconds waiting time, re-electrify the indoor fan. If still has no impulse
signal feedback by the indoor motor being detected within 10 seconds, the controller stays in
waiting and the digital display indicates the corresponding fault code is E4.Turn off the
air-conditioner by remote control, and the fault display will not show.
⒁The definition to swing angle of the air door
Picture 3 shows the swing angle of the step motor of E series wall-mounted type air-conditioner under
4.8kW (Except 4.8 kW);
① Once being electrified, the air door effect a motion of total closed, and the swinging speed is
22°/s；
② After the air-conditioner turns on, the air door effect a motion of total opening, and swing to the
corresponding primary position. The primary position for heating mode is the position 5(Picture 3),
for cooling mode is the position 2 (Picture 3).
③ The air door “Swing” on the remote control can set the swinging mode to be automatic swing or
hand swing；
④ The maximum swing angle of automatic swing under heating mode is 50°，e.g. the angle between
position 3-5 in picture 3；the angle under cooling mode is 50°e.g. the angle between position 2-4 in
picture 3；The swinging speed is 5.5°/s；
⑤After the air-conditioner being turned on and electrified, if the air door is not set “Swing”, the swing
angle will swing to the corresponding position according to the different modes. For example: the
corresponding position under cooling mode is position 2(Picture 3), heating mode is position 5(Picture
3). The air door resumes the automatic swing after the fan starts. If the setting swing mode is hand
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AUX air conditioner service manual
swing, the swing angle will never change；
⑥After turning off the air-conditioner and stopping the running of the indoor fan, the air door shut off
automatically;
⑦Enter into the automatic mode by pressing the Emergency button, the air door opens after the
setting mode of the system starts. Before the starting of the setting mode, the air door parks at the
datum mark of cooling mode.
The below picture shows the swing angle of E type:
Picture 3
⒂The wind speed selection function
The resistance value of the wind speed option is as below:
High Fan
R24
Middle Fan
R28
Low Fan
R26
1330
1.2K
1250
1.2K
1100
1.2K
1280
3K
1200
3K
1050
3K
1230
5.1K
1150
5.1K
1000
5.1K
1180
8.2K
1100
8.2K
950
8.2K
1130
12K
1050
12K
900
12K
1080
20K
1000
20K
850
20K
1030
36K
950
36K
800
36K
980
82K
900
82K
750
82K
Note: The mute wind speed under heating mode is 850r/min. and 800r/min for non-heating
mode. The breeze speed is 650r/min.
The controller added the function of high efficient wind speed, which bases on the previous strong fan
plus 100r/min.
⒃Optional functions
The below functions’ program are already write into the Main chip of the PCB and to be performed if
being equipped with the corresponding hardware. For example, the “Auto-restart” function shall be
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AUX air conditioner service manual
equipped with the corresponding E2 main chip, the “I feel” function shall be equipped with the
corresponding remote controller, and the “Negative ion” shall be equipped with the corresponding
relay.
①Auto-restart control function
a)The setting method for Auto-restart function: After the controller being electrified, press the sleeping
button on the remote control for 10 times within 5seconds towards to the controller, later, if the
Auto-restart function is successfully set, there are four sounds delivered from the buzzer; If the
Auto-restart function need to be cancelled, press the sleeping button of the remote control for 10 times
within 5seconds towards to the controller, later, if the Auto-restart function is successfully cancelled,
there are two sounds delivered from the buzzer otherwise there is no sound；
b) The contents memorized by the Auto-restart function are: operation modes, setting wind speed,
setting temperature, negative ion function, swing status and on-off condition.
c) After the setting of non-electricity memory function succeeds, when the non-electricity event
happens after turning off the air-conditioner normally, if re-electrify and turn on the air-conditioner,
there is no 3 minutes protection delay occurred to the compressor; when the non-electricity event
happens accidentally under the power-on status, if re-electrify and turn on the air-conditioner, there is
3 minutes protection delay occurred to the compressor;
d) If the setting of sleeping and timing functions occurs before the non-electricity event after
air-conditioner owns the Auto-restart function, the default condition of the controller is power-off
status after being electrified again.
②I feel function
a)The setting method for I feel function: Press the “I feel” function button on the remote controller, the
controller will effect the I feel function once receiving the signal, and the controller herein will default
the temperature value of the sensor on the remote control as the previous TA of the controller（Except
the defrosting case）；
b) The quitting method for the I feel function：
●Press the I feel function button, the former I feel function setting will be cancelled at once;
●Position the remote controller towards to the receiving window of the controller, the remote
control may deliver the signal to the controller every 3minutes. If the controller fails to receive the
signal from the remote control, the I feel function will be automatically cancelled, and the TA control
the temperature according to the temperature value detected by the TA sensor of the PCB.
c) When the I feel function starts, the controller doesn’t test the former TA sensor on the PCB.
③Negative ion function
When the indoor fan is working, press the negative ion function button on the remote control, and the
negative ion relay in the controller turns on for starting the output of the negative ions; When the
negative ion function is on, press the negative ion function button on the remote control, and the
negative ion relay in the controller turns off for stopping the output of the negative ion;
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Ⅲ.The basic function introduction of the split wall-mounted type Electric controller
(18000BTU~24000BTU)
1. The basic conditions for the operation of the controller
⑴The applicable voltage range of the electrical power: The input voltage 103 V – 230V;
⑵The input AC current frequency: 60Hz；
⑶The operating temperature for electric control: （-10~+70）℃;
⑷The operating moisture for electric control: RH20%~RH90%;
⑸The indoor fan: RP plastic-sealed motor, three-impulse feedback signal;
⑹The outdoor fan: tap iron-shell motor, only one speed and the normal working current shall be
lower than 1.5A;
⑺The normal working current of the four-way valve: lower than 1.9A/115VAC;
⑻The Swing Motor: DC12V, Four phase eight step stepping motor;
⑼Compressor: Single-phase power supply, the normal working current shall less than 20A.
2. Partition of the controller’s function
The function of the controller consists of the following parts:
⑴The remote control receiving function;
⑵Force operation function;
⑶The air vane’s automatic swing function and the position setting function;
⑷The buzzer’s driving function;
⑸The indoor fan’s driving function;
⑹The timing on-off function;
⑺The compressor restarting protection function;
⑻The indoor heat-exchanger overheating protection function under heating mode;
⑼The automatic defrosting and reheating function under heating mode;
⑽The anti-cold air functions under heating mode;
⑾The anti-freezing function under cooling and defrosting modes;
⑿Self-detecting function
3. The Specification of the main function
⑴he specialty terms and express:
TA: stands for the indoor ambiance temperature;
TE: stands for the indoor evaporator’s temperature;
TS: stands for the setting temperature;
TW: stands for the outdoor condenser’s temperature;
⑵Emergency switch
①The air-conditioner turns off if press on this button when the air-conditioner is working; the
air-conditioner turns on if press on this button when the air-conditioner is off, and it will work in an
automatic mode after press on this button. Then the indication light twinkles for 20 seconds and the
air-conditioner does not start working until the working mode to be selected by the system; the
air-conditioner automatically selects one of the cooling, dehumidification, and heating mode as the
working mode according to the indoor air temperature.
a) When TA≥27℃, the controller enters into the cooling mode and follows the mode in working. The
setting temperature herein is 24℃ and the setting wind speed is strong wind;
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AUX air conditioner service manual
b) When 20℃< TA < 27℃, the controller enters into the dehumidifying mode and follows the mode in
working. The setting temperature is 24℃ and the setting wind speed is strong wind;
c) When TA≤20℃, the controller enters into the heating mode and follows the mode in working (The
cooling only type runs with the ventilation mode). The setting temperature herein is 24℃ and the
setting wind speed is strong wind;
d)This mode includes the functions of timing, sleeping, auto-restart (optional), negative ion (optional),
I feel（optional）; The system mode will not change along with the variety of the indoor temperature
after being selected. The default status of the horizontal air-blade is still. The operation can be
adjustable by receiving the remote signal.
Press this force on-off button without release at least 5 seconds until the ring of the buzzer rings twice.
The controller enters into the trial operation the trial operation time is 30min:
●The sensor of the air-inlet temperature doesn’t function in the period of trial operation. The
compressor starts work after the 3min delay protection (The primary electrifying has no 3min delay
protection), the wind speed of the indoor fan is high wind, the running mode is cooling mode, and the
wind door is maximum opening.
● There are no anti-freezing protection and high temperature-preventing protection during trial
operation.
⑶Automatic mode
When controller selects an automatic working mode, the indication light twinkles for 20 seconds and
the air-conditioner does not start working until the working mode to be selected by the system; The
air-conditioner automatically selects one of the cooling, dehumidification, and heating mode as the
working mode according to the indoor air temperature .
①When TA≥27℃, the controller enters into the cooling mode and follows the mode in working. The
setting temperature herein is 24℃ and the air-conditioner runs according to the setting wind speed;
②When 20℃<TA<27℃, the controller enters into the dehumidification mode and follows the mode
in working. The setting temperature is 24℃ and the air-conditioner runs according to the setting wind
speed;
③When TA≤20℃, the controller enters into the heating mode and follows the mode in working (The
cooling only type follow the ventilation mode). The setting temperature herein is 24℃ and the
air-conditioner runs according to the setting wind speed;
④This mode includes the functions of timing, sleeping, auto-restart(optional), negative ion(optional),I
feel（optional）;
⑤The system mode will not change along with the variety of the indoor temperature after being
selected. The new working mode will be selected again after air-conditioner turns off or mode switch.
⑷Cooling mode
The setting temperature shall be fixed by the remote control. The temperature-controlling range is
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AUX air conditioner service manual
16℃ - 32℃. The setting temperature can be adjusted through the button of “+” “-”. The setting wind
speed can be adjusted through the button of “wind speed selection” in the selection of the four wind
speeds type, such as strong wind, high wind, low wind and mute wind. The four-way valve always is
closed under this mode. The other action is as following:
①When TA - TS≥1℃，after the compressor meet the 3 minutes delay protection, the compressor and
the outdoor fan start running;
②When TA = TS，maintain the previous status;
③When TA - TS≤-1℃，after the compressor meet the 3 minutes protection condition, the compressor
and the outdoor fan turn off;
④The setting wind speed can be adjusted by the remote control during the ongoing cooling process,
and the interior fan still retains working;
⑤When the status of TE ≤ 0℃ last for 10 seconds and the compressor keeps working for above than 5
minutes, turn off the compressor and outdoor fan, the indoor fan keep working according to the setting
wind speed; Quit from such protection if TE≥ 7℃;
⑥This mode includes the functions of timing, sleeping, auto-restart (optional), negative ion (optional),
I feel（optional）;
⑦When the cooling ongoing，the button of the “Swing” can control the swing and stop of the
horizontal air-blade;
⑧Automatic wind-speed control：
TA - TS≥3℃，wind-speed works at high wind;
TS +1℃≤TA＜TS +3℃，wind-speed works at middle wind;
TA – TS＜1℃，wind-speed works at low wind;
Without 3 minutes delay when the wind speed turns into the high wind from the low wind, otherwise
with 3 minutes delay;
⑨Being initially electrified, the compressor doesn’t have the 3 minutes delay protection, the outdoor
fan starts after 2 seconds of the compressor’s start; When TS＞TA set by the remote control, the
compressor turns off immediately with no need of 3 minutes delay protection;
⑩When TE ≥ 64℃ and after last for 10seconds, the compressor and the outdoor fan turn off; If meet
the 3 minutes delay condition and TE ≤ 62℃, the compressor can start normally. When the
air-conditioner is under overheating protection, if the wind speed setting is by hand, the indoor fan
unit will run at the setting wind speed; if the wind speed setting is automatic, the indoor fan unit runs
at the low fan speed.
⑸Dehumidification mode
①The four-way valve always turns off when the dehumidification mode is ongoing. The control range
of the temperature is: 16℃ - 32℃.
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②Under the dehumidification mode, after the 3 minutes delay conditions being meet satisfactorily, the
performance of the compressor and the outdoor fan is as following:
a)TA ≥ TS+2℃，the compressor and the outdoor fan works continuously, the wind speed retains the
setting wind speed;
b) TS ≤ TA < TS+2℃，the compressor and the outdoor fan runs for 10minutes and stops for 6
minutes，The indoor fan turns off during the compressor’s 3 minutes stopping period and keeps on
working in breeze mode under other conditions;
c)TA < TS，the compressor and the outdoor fan stop working, and the indoor fan start to work in
breeze mode after stopping for 3 minutes；
Automatic wind-speed control：
TA - TS≥5℃，the wind speed is at high wind;
TS +3℃≤TA＜TS +5℃，the wind speed is at middle wind;
TS +2℃≤TA＜TS +3℃，the wind speed is at low wind;
TS≤TA＜TS +2℃，the wind speed is at fitful breeze;
TA＜TS，the indoor fan is off during the 3 minutes delay of the compressor, and 3 minutes
later, the wind is at breeze speed.
③The primary electrifying to compressor has no 3 minutes protection delay, the outdoor fan starts 2
seconds later after the start of the compressor;
④When the indoor fan runs, the air door can be set as free swing, and the swing condition is same as
the one under cooling mode；
a)When TE ≤ -2℃ last for 10seconds and the compressor runs continuously for above 5minutes，if
turn off the compressor and outdoor fan, the indoor fan runs at the setting wind speed; If TE ≥ 7℃，
quit from the protection；
b) When TE ≥ 64℃ last for 10seconds, the compressor and outdoor fan unit turns off. If meet the 3
minutes delay condition and TE ≤ 62℃, the compressor can start normally. When the air-conditioner
is under overheating protection, if the wind speed setting is by hand, the indoor fan unit will run at the
setting wind speed; if the wind speed setting is automatic, the indoor fan unit runs at the low fan
speed.
⑤This mode includes the functions of timing, sleeping, auto-restart (optional), negative ion (optional),
I feel（optional）.
⑹Ventilation mode
Under ventilation mode, the outdoor unit is always off, the indoor fan runs at the setting wind speed,
the remote control can set high fan, middle fan and low fan except automatic fan; The performance
condition of the air door is same as the one under refrigeration mode; This mode includes the timing
function, auto-restart (optional), negative ion (optional), I feel（optional）
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⑺Heating mode
The setting temperature can be decided and adjusted by the remote control within the control range of
16℃ - 32℃ through the button of temp. Add “+” and temp. Reduce “-”. Press the button “wind speed
option” to choose the wind speed among the options of automatic fan, high fan, middle fan and mute
fan. The other conditions refer to the following:
⑴When TA-3-TS≤-1℃，if satisfying the 3 minutes protection delay condition for compressor, the
compressor and outdoor fan start, and the indoor fan runs in accordance with the anti-cold wind
condition.
⑵When TA-3-TS≥1℃，if satisfying the 3 minutes protection delay condition for compressor，the
compressor and outdoor fan stop working, and the indoor fan runs in accordance with the anti-cold
wind condition.
⑶When TA-3=TS，remain the previous status；
⑷Temperature display has the temperature compensation of 3℃
⑸Automatic wind speed control：
TA ＜ TS，run at high fan speed；
TS ≤ TA＜TS +2℃，run at middle fan speed；
TA ≥ TS + 2℃，run at low fan speed；
There is no 3 minutes protection delay when the wind speed turns to high fan from the low fan; there
is 3 minutes protection delay when the wind speed turns to low fan from the high fan;
⑹When heating process ongoing, the button of “Swing” can control the swing leaves to swing or
stop；
⑺Being electrified initially, the compressor has no 3 minutes protection delay. The compressor starts
10 seconds later after the start of the four-way valve, and the outdoor fan starts 2 seconds later after
the start of the compressor; Set the TS ＜TA-3 by remote control，the compressor stops immediately
and without the 3 minutes protection delay;
⑻This mode includes the timing function, sleeping function, auto-restart (optional), negative ion
(optional), I feel（optional）.
⑼Being electrified initially, the four-way valve starts immediately ,and the compressor starts 10
seconds later; During the operation condition of the compressor, the four-way valve stops after
2min50s protection delay when stops the air-conditioner or switch mode;
In the case of compressor stops, the four-way valve stops immediately once stopping the
air-conditioner；
⑽Anti-cooling wind and residual-heat Removing function:
The wind speed of the indoor fan is controlled by TE, and the specific conditions are as below:
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Anti-cold wind when compressor runs：
①When TE is in rise status, if Te<30℃,the indoor fan turns off;30℃≤TE＜38℃,the indoor fan runs
at low fan speed;Te≥38℃, the indoor fan runs at setting wind speed;
②When Te in fall status, if TE>34℃,the indoor fan runs at the setting fan speed;28℃＜TE≤34℃,the
indoor fan runs at the low fan speed;TE≤28℃，the indoor fan turns off.
（Picture 1）
Anti-cold wind function when compressor stops：
① When TE is in the fall status, if TE>30℃,the indoor fan runs at low fan speed;TE30≤℃,indoor
fan turns off;
② When TE is in the rise status, if TE35≥℃, the indoor fan runs at low fan speed; TE35<℃, indoor
fan turns off;
（Picture 2）
Residual-heat removing function after air-conditioner stops：
When TE＞35℃，the indoor fan runs at the low fan speed, if≤35℃,the indoor fan turns off, and
air-conditioner stops for starting the process of residual heat removal and last for ≤10seconds, within
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AUX air conditioner service manual
the 10second of process of residual heat removal, if TE< 35℃, the indoor fan turns off at once.
⑾Anti-high temperature protection：
①when run on Heating mode，if TE≥57℃ and continuously last 10 seconds, the outdoor fan stops; if
TE≥64℃ and last for 10s，the compressor stops again；When TE< 52℃ and satisfying 3minutes
protection delay condition, the compressor resume normal work.。
②Such temperature protection is valid only if the TE sensor works normally.
⑿The defrosting function under heating mode
①When the outdoor sensor in good condition, the defrosting process starts, and the sleeping light is
twinkling：
a)TW≤-6℃ and continuously last for 2minutes；
b)The accumulated operation time of the compressor is over than 50 minutes, the interval time
between defrosting process is 50 minutes(the accumulated time shall be recalculated if power off or
remote control off ), the continuous working time of the compressor is over 5 minutes.
Once the defrosting process starts, the compressor, the indoor fan and outdoor fan turn off, and the
four-way valve turns off after 30 seconds, and after another 15 seconds the compressor turns on and
starts the defrosting process.
②The defrosting process ending condition：（The defrosting process will quit if one of the below
conditions to be satisfied）
a) Outdoor coil≥12℃；
b) Defrosting process last for 12minutes；
c) The defrosting process quits once change modes or air-conditioner turns off by remote control.
After the defrosting process, the compressor turns off and the outdoor fan turns on; After 55 seconds,
the four-way valve turns on; after another 5 seconds, the compressor turns on; the air-conditioner
resume the normal heating process, the indoor fan runs in the mode of anti-cold wind.
⑻ Auxiliary electric heating function
a)When heating mode working normally, e.g. the compressor starts and the outdoor fan runs and the
four-way valve is electrified and the indoor fan starts, the electric heating starts if satisfying the below
conditions:
A、TE < 48℃；
B、TA < 22℃；
C、TS – TA ≥ 3℃；
D、The compressor runs continuously for 4 minutes with the heating mode;
②The auxiliary electric heating quit operation if satisfying one of the below conditions：
A、TA > 22℃；
B、TS – TA < 2℃；
C、TE > 52℃；
③If anyone of the compressor, four-way valve and indoor fan doesn’t work or fault feedback from the
indoor fan, the auxiliary electric heating quit operation；
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④The auxiliary electric heating may be allowed to restart after 1 minutes rest if the auxiliary electric
heating quit during the operation process of the compressor.
⑼ Sleeping control function
The sleeping function is valid during the automatic, cooling, dehumidifying and heating process. The
indoor fan runs at low fan speed during sleeping mode, and the sleeping indication light on;
After turning into the sleeping process by pressing down the button of “sleeping” on the remote
controller, to the Cooling process, the setting temperature rises by 1℃ automatically one hour later; to
the Heating process, the setting temperature falls by 2℃ automatically one hour later. After another 1
hour, the setting temperature of the Cooling process raises another 1℃, and the one of the Heating
process falls another 2℃. The sleeping process lasts 7 hours until air-conditioner turns off.
During the sleeping process, the mode switching operation is allowed and workable, but it will delete
the sleeping function. The air-conditioner will run at the temperature of “new setting temperature +
temperature correction” if press the button of add temp.“+”.Under the sleeping status, if press down
the button of “sleeping” or change modes or on-off, the sleeping process will be deleted and ended.
The sleeping process under cooling mode:
Setting temperature
rises another 1℃
rises 1℃
Previous Setting
temperature
1h
2h
7h（end sleeping process，turn off）
The sleeping process under heating mode:
Setting temperature
Previous setting
temperature
falls 2℃
Falls another 2℃
1h
2h
7h（end sleeping process，turn off）
⑽Timing control function
The time range of the Timing control set is 24 hours, and the time unit is minute, single
timing mode. The conversion of the modes doesn’t cancel the timing function, and the timing
indication light turns on after timing setting.
①Timing turns off
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AUX air conditioner service manual
The timing turns off function can be set only under the running status of the air-conditioner. The
timing range is 1min.-24hour. The air-conditioner stops automatically once the setting timing reached.
②Timing turns on
The timing turns on function can be set only under the running status of the air-conditioner. The
timing range is 1min.-24hour. The air-conditioner turns on automatically once the setting timing
reached. The turning on and turning off action happen after setting timing set will cancel the previous
set setting timing and sleeping functions
⑾ Self-detecting function
Press the Emergency button and electrify the air-conditioner, the self-detecting process starts
after the buzzer delivers short tone twice:
Start the electric heating, run the indoor fan at a high fan speed, open the air door to be the
maximum Æthe digital display and three indicating light on in 1 secondÆ digital displays
“11”、“22”、“33”、“44” in turn and 1second for each of them ÆWorking light on 1 second
ÆTiming light on 1 second ÆSleeping light on 1 second ÆEach phase of the stepping motor
moves in 1 second Æthe indoor fan runs for 1 second at low fan speed and middle fan speed
separatelyÆthe compressor moves for 1 second ÆThe four-way valve moves for 1 second
ÆOutdoor fan moves for 1 second ÆNegative ion generator moves for 1 second Æbuzzer
deliver one short toneÆElectric heating runs 30 Seconds and stops, then the air conditioner
turn into the waiting status, the self-testing is ended.
⑿Fault indication
When there is faults happen to the air-conditioner, the timing lights on the display panel will indicate
the corresponding fault codes, which are specifically reflected as the following:
For LED display:
FAULT
DISPLAY MODE
DISPLAY
APPEARANCE
PRIORITY
TA
2
AC stopped
Timer lamp flash 1
abnormity
times/8 seconds
TE
Timer lamp flash
3
AC stopped
abnormity
2 times/8 seconds
TW
Timer lamp flash
4
AC hasn’t stopped
abnormity
8 times/8 seconds
For Digital display:
FAULT
TA abnormity
TE abnormity
TW abnormity
DISPLAY
MODE
display“E1”
display “E3”
display “E2”
DISPLAY
PRIORITY
2
3
4
⒀The definition of the swing angle
51
APPEARANCE
AC stopped
AC stopped
AC hasn’t stopped
AUX air conditioner service manual
(Picture 3)It shows the swing angles of the types 18000BTU and 24000BTU stepping motor，the air
door’s swing angle of 18000BTU,24000BTU and 7000BTU,12000BTU are same，but the swing
directions of the motors are not same.
①Once being electrified, the air door effect a motion of totally closed, and the swinging speed is 1
step/4ms；
②After the air-conditioner turns on, the air door effect a motion of total opening, and swing to the
corresponding primary position. The primary position for Heating mode is the position 5(Picture 3),
for Cooling mode is the position 2 (Picture 3).
③The “Swing” button on the remote controller can set the Horizontal air-blade to be swing
Automatically or not；
④The maximum swing angle of automatic swing under Heating mode is 40°，e.g. the angle between
3-5 in picture 3；the angle under Cooling mode is 40°e.g. the angle between 2-4；The swinging speed
is 1step/16ms;
⑤When the indoor fan stops operation, if the setting swinging mode set by the remote control is
automatic swinging, the Horizontal air-blade will turn to the corresponding position and to be
orientated. For example: the corresponding position under Cooling mode is position 2(Picture 3), for
Heating mode is position 5(Picture 3), resume the automatic Swing once the fan motor starts; if the
setting swing mode is Manual, the swing angle of the Horizontal air-blade will never change；
⑥After turning off the air-conditioner and stopping the running of the indoor fan, the air door will
shut off automatically;
⑦Enter into the Auto-run mode by pressing the Emergency switch, the setting status of the air door is
in accordance with the Cooling mode, and will be adjusted again after the new mode is selected.
(Picture4)
⒁ Wind speed option function
52
AUX air conditioner service manual
18000BTU-24000BTU are RP plastic-sealed motor， the rotate speed can not be controlled by the
PCB.
⒂Optional functions
The below functions’ programs are already write into the Main chip of the PCB, and can be performed
if only the corresponding hardware is available. For example: the E2 CMOS chip is in need for the
Auto-restart function, the corresponding remote control is in need for the I feel function, and the relay
is in need for the Negative ion function.
①Auto-restart control function
a)The setting method for Auto-restart function: After the controller being electrified, press the sleeping
button on the remote control for 10 times within 5seconds towards to the controller, later, if the
Auto-restart function is successfully set, there are four sounds delivered from the buzzer; If the
Auto-restart function need to be cancelled, press the sleeping button of the remote control for 10 times
within 5seconds towards to the controller, later, if the Auto-restart function is successfully cancelled,
there are two sounds delivered from the buzzer otherwise there is no sound；
b) The contents memorized by the Auto-restart function are: operation modes, setting wind speed,
setting temperature, negative ion function, swing status and on-off condition.
c) After the setting of non-electricity memory function succeeds, when the non-electricity event
happens after turning off the air-conditioner normally, if re-electrify and turn on the air-conditioner,
there is no 3 minutes protection delay occurred to the compressor; when the non-electricity event
happens accidentally under the power-on status, if re-electrify and turn on the air-conditioner, there is
3 minutes protection delay occurred to the compressor;
d) If the setting of sleeping and timing functions occurs before the non-electricity event after
air-conditioner owns the Auto-restart function, the default condition of the controller is power-off
status after being electrified again.
②I feel function
a)The setting method for I feel function: Press the “I feel” function button on the remote controller, the
controller will effect the I feel function once receiving the signal, and the controller herein will default
the temperature value of the sensor on the remote control as the previous TA of the controller（Except
the defrosting case）；
b) The quitting method for the I feel function：
●Press the I feel function button, the former I feel function setting will be cancelled at once;
●Position the remote controller towards to the receiving window of the controller, the remote
control may deliver the signal to the controller every 3minutes. If the controller fails to receive the
signal from the remote control, the I feel function will be automatically cancelled, and the TA
control the temperature according to the temperature value detected by the TA sensor of the PCB.
c) When the I feel function starts, the controller doesn’t test the former TA sensor on the PCB.
③Negative ion function
53
AUX air conditioner service manual
When the indoor fan is working, press the negative ion function button on the remote control, and the
negative ion relay in the controller turns on for starting the output of the negative ions; When the
negative ion function is on, press the negative ion function button on the remote control, and the
negative ion relay in the controller turns off for stopping the output of the negative ion;
54
AUX air conditioner service manual
Section two
the tech. parameter of part products
1、Parameter for R22 、H Series、208-230V/60HZ products
ASW-09A2/H#
ASW-H09A2/H#
Model
Indoor
Outdoor
Indoor
Outdoor
Item
Input
Performance
Type
ASW-H12A2/H#
Indoor
Indoor
Outdoor
Outdoor
Wall -mounted
Wall -mounted
Wall -mounted
Wall -mounted
Cooling capacity
Kw
2.5
2.5
3.2
3.2
Heating capacity
Kw
/
2.8
/
3.8
Dehumidifying
Kg/h
1.0
1.0
1.2
1.2
3
Air
circulation
Cooling
m /h
420
/
420
/
520
/
520
/
Heating
3
m /h
/
/
420
/
/
/
520
/
Noise
lever
Cooling
dB
40
50
40
50
41
51
41
51
Heating
dB
/
/
40
50
/
/
41
51
Power-supply
φ--V--Hz
Rated power
consumption
Cooling
1/208-230V/60Hz
1/208-230V/60Hz
1/208-230V/60Hz
1/208-230V/60Hz
W
920
940
1230
1250
Heating
W
/
940
/
1220
Rated
current
Cooling
A
4.3
4.4
5.8
5.8
Heating
A
/
4.4
/
5.7
Input
factor
Cooling
%
98%
98%
Heating
%
/
98%
/
98%
A
24
24
26
26
Starting current
Power supply
cord
Length
m
Type
Fuse capacity
A
Motor
/
250V 16A
/
/
250V 16A
3.15
/
3.15
/
165*80
165*80
2*296
320*81
8*540
176*89
2*262
320*81
8*540
176*89
2*262
320*81
8*540
2*296
320*81
8*540
Inch
/
/
/
/
/
/
/
/
Kg
9.5
32
9.5
33
10.5
37
10.5
38
Liquid(mm)
OD×L
φ6.35×3600
φ6.35×3600
φ6.35×3600
φ6.35×3600
Gas(mm)
OD×L
φ9.52×3600
φ9.52×3600
φ9.52×3600
φ9.52×3600
ID×L
φ14×780
φ14×780
φ14×780
φ14×780
/
Rotary
/
Rotary
/
Rotary
/
Rotary
/
/
/
/
/
/
/
/
/
920
/
920
/
1220
/
1250
Throug
Axial-fl
ow fan
Throug
Axial-fl
ow fan
Throug
Axial-fl
ow fan
Throug
Axial-fl
ow fan
Plastic-
sealed
Iron
shell
Plastic-
sealed
Iron
shell
Plastic-
sealed
Iron
shell
sealed
Iron
shell
13
25
13
25
19
25
19
25
2×10
1×10
2×10
1×10
2×12
1×10
2×12
1×10
D×W×H
Type
Rated input
W
Type
h-flow
or
250V 10A
/
/
Type
Motor
/
3.15
Drain pipe (mm)
Fan-motor
/
/
Net weight
Compresso
/
98%
3.15
Dimension
Connection
pipe
/
250V 10A
mm
Dimension
ASW-12A2/H#
Type
Rated input
Heat exchanger (Row×line)
Plastic-
W
h-flow
h-flow
h-flow
Refrigerant control
Capillary
Capillary
Capillary
Capillary
Freezed oil capacity
/
/
/
/
R22/650
R22/690
R22/760
R22/740
Refrigerant/Charge (g)
Protection equipment
Rated Cooling
test condition
/
Inner
/
Inner
Indoor unit: DB:27℃, WB:19℃
55
/
Inner
/
Inner
Outdoor unit: DB:35℃, WB:24℃
AUX air conditioner service manual
Rated Heating
test condition
Indoor unit: DB:20℃, WB:------
Outdoor unit: DB:7℃, WB:6℃
Max. Cooling
test condition
Indoor unit: DB:32℃, WB:23℃
Outdoor unit: DB:43℃, WB:26℃
Max. Heating
test condition
Indoor unit: DB:27℃, WB:------
Outdoor unit: DB:24℃, WB:18℃
Model
Item
ASW-18B2/H#
ASW-H18B2/H#
ASW-24B2/H#
ASW-H24B2/H#
Indoor
Indoor
Indoor
Indoor
Input
Performance
Type
Outdoor
Outdoor
Outdoor
Wall -mounted
Wall -mounted
Wall -mounted
Wall -mounted
Cooling capacity
Kw
5.3
5.3
7.0
7.0
Heating capacity
Kw
/
5.8
/
7.7
Dehumidifying
Kg/h
2.12
4.12
2.8
2.8
3
Air
circulation
Cooling
m /h
840
/
840
/
1000
/
1000
/
Heating
3
m /h
/
/
880
/
/
/
1050
/
Noise
lever
Cooling
dB
46
57
46
57
48
57
48
57
Heating
dB
/
/
46
57
/
/
48
57
Power-supply
φ--V--Hz
Rated power
consumption
Cooling
1/208-230V/60Hz
1/208-230V/60Hz
1/208-230V/60Hz
1/208-230V/60Hz
W
2000
2000
2600
2600
Heating
W
/
2000
/
2700
Rated
current
Cooling
A
9.5
9.5
12.0
12.0
Heating
A
/
9.5
/
12.3
Input
factor
Cooling
%
98%
98%
Heating
%
/
98%
/
98%
A
47.5
47.5
60
60
Starting current
Power supply
cord
Length
m
A
Motor
250V 16A
/
/
250V 25A
/
250V 25A
/
3.15
/
3.15
/
1005×3
1005×32
20×215
800*30
0*690
1150×3
0×200
800*30
0*690
1150×3
20×200
800*30
0*690
20×215
800*30
0*690
Inch
/
/
/
/
/
/
/
/
Kg
16
47
16
49
19
49
19
51
Liquid(mm)
OD×L
φ6.35×3600
φ6.35×3600
φ9.52×3600
φ9.52×3600
Gas(mm)
OD×L
φ12.7×3600
φ12.7×3600
φ15.88×3600
φ15.88×3600
ID×L
φ14×1100
φ14×1100
φ14×1100
φ14×1100
/
Rotary
/
Rotary
/
Rotary
/
Rotary
/
/
/
/
/
/
/
/
/
1960
/
1960
/
2425
/
2425
Throug
Axial-fl
ow fan
Throug
Axial-fl
ow fan
Throug
Axial-fl
ow fan
Throug
Axial-fl
ow fan
Plastic-
sealed
Iron
shell
Plastic-
sealed
Iron
shell
Plastic-
sealed
Iron
shell
sealed
Iron
shell
25
68
25
68
30
68
30
68
2×18
2×30
2×18
2×30
2×17
2×26
2×17
2×26
D×W×H
Type
Type
Rated input
W
Type
h-flow
or
/
3.15
Drain pipe (mm)
Motor
/
/
Net weight
Fan-motor
/
98%
3.15
Dimension
Compresso
/
250V 16A
mm
Connection
pipe
/
Type
Fuse capacity
Dimension
Outdoor
Type
Rated input
Heat exchanger (Row×line)
Plastic-
W
h-flow
h-flow
h-flow
Refrigerant control
Capillary
Capillary
Capillary
Capillary
Freezed oil capacity
/
/
/
/
R22/1350
R22/1650
R22/1950
R22/2050
Refrigerant/Charge (g)
Protection equipment
/
Inner
/
56
Inner
/
Inner
/
Inner
AUX air conditioner service manual
Rated Cooling
test condition
Indoor unit: DB:27℃, WB:19℃
Outdoor unit: DB:35℃, WB:24℃
Rated Heating
test condition
Indoor unit: DB:20℃, WB:------
Outdoor unit: DB:7℃, WB:6℃
Max. Cooling
test condition
Indoor unit: DB:32℃, WB:23℃
Outdoor unit: DB:43℃, WB:26℃
Max. Heating
test condition
Indoor unit: DB:27℃, WB:------
Outdoor unit: DB:24℃, WB:18℃
2、Parameter for R22 、E Series、208-230V/60HZ products
ASW-09A2/E#
ASW-H09A2/E#
Model
Indoor
Outdoor
Indoor
Outdoor
Item
Input
Performance
Type
Indoor
Outdoor
ASW-H12A2/E#
Indoor
Outdoor
Wall -mounted
Wall -mounted
Wall -mounted
Wall -mounted
Cooling capacity
Kw
2.5
2.5
3.2
3.2
Heating capacity
Kw
/
2.75
/
3.55
Dehumidifying
Kg/h
1.0
1.0
1.2
1.2
3
Air
circulation
Cooling
m /h
430
/
430
/
520
/
550
/
Heating
3
m /h
/
/
430
/
/
/
550
/
Noise
lever
Cooling
dB
38
50
38
50
41
52
41
52
Heating
dB
/
/
38
50
/
/
41
52
Power-supply
φ--V--Hz
Rated power
consumption
Cooling
1/208-230V/60Hz
1/220-240V/50Hz
1/220-240V/50Hz
1/220-240V/50Hz
W
990
1000
1250
1250
Heating
W
/
960
/
1220
Rated
current
Cooling
A
4.5
4.5
5.5
5.5
Heating
A
/
4.4
/
5.2
Input
factor
Cooling
%
98%
98%
Heating
%
/
98%
/
98%
A
24
24
34
34
Starting current
Power supply
cord
Length
m
Type
Fuse capacity
A
Motor
/
250V 16A
/
/
250V 16A
3.15
/
3.15
/
210*74
320*818
210*74
320*818
210*74
320*818
210*74
320*818
5*250
*540
5*250
*540
5*250
*540
5*250
*540
Inch
/
/
/
/
/
/
/
/
Kg
9.5
32
9.5
33
9.5
35
9.5
36
Liquid(mm)
OD×L
φ6.35×3600
φ6.35×3600
φ6.35×3600
φ6.35×3600
Gas(mm)
OD×L
φ9.52×3600
φ9.52×3600
φ12.7×3600
φ12.7×3600
ID×L
φ14×780
φ14×780
φ14×780
φ14×780
/
Rotary
/
Rotary
/
Rotary
/
Rotary
/
/
/
/
/
/
/
/
/
920
/
920
/
1235
/
1235
Throug
Axial-fl
ow fan
Throug
Axial-fl
ow fan
Throug
Axial-fl
ow fan
Throug
Axial-fl
ow fan
Plastic-
sealed
Iron
shell
Plastic-
sealed
Iron
shell
Plastic-
sealed
Iron
shell
sealed
Iron
shell
13
25
13
25
19
25
19
25
2×11
1×11
2×11
1×11
2×13
1×11
2×13
1×11
D×W×H
Type
Rated input
W
Type
h-flow
or
250V 10A
/
/
Type
Motor
/
3.15
Drain pipe (mm)
Fan-motor
/
/
Net weight
Compresso
/
98%
3.15
Dimension
Connection
pipe
/
250V 10A
mm
Dimension
ASW-12A2/E#
Type
Rated input
Heat exchanger (Row×line)
Plastic-
W
h-flow
h-flow
h-flow
Refrigerant control
Capillary
Capillary
Capillary
Capillary
Freezed oil capacity
/
/
/
/
R22/560
R22/640
R22/700
R22/680
Refrigerant/Charge (g)
57
AUX air conditioner service manual
Protection equipment
/
EXTERNAL
/
EXTERNAL
/
EXTERNAL
/
EXTERNAL
Rated Cooling
test condition
Indoor unit: DB:27℃, WB:19℃
Outdoor unit: DB:35℃, WB:24℃
Rated Heating
test condition
Indoor unit: DB:20℃, WB:------
Outdoor unit: DB:7℃, WB:6℃
Max. Cooling
test condition
Indoor unit: DB:32℃, WB:23℃
Outdoor unit: DB:43℃, WB:26℃
Max. Heating
test condition
Indoor unit: DB:27℃, WB:------
Outdoor unit: DB:24℃, WB:18℃
Model
Item
Indoor
Input
Performance
Type
Outdoor
ASW-H18A2/E#
Indoor
Outdoor
Wall -mounted
Wall -mounted
Cooling capacity
Kw
5.1
5.2
Heating capacity
Kw
/
5.7
Dehumidifying
Kg/h
2.04
2.04
3
Air
circulation
Cooling
m /h
850
/
850
/
Heating
3
m /h
/
/
900
/
Noise
lever
Cooling
dB
48
57
48
57
Heating
dB
/
/
48
57
Power-supply
φ--V--Hz
Rated power
consumption
Cooling
1/208-230V/60Hz
1/208-230V/60Hz
W
2100
1950
Heating
W
/
1950
Rated
current
Cooling
A
9.6
9.0
Heating
A
/
9.0
Input
factor
Cooling
%
Heating
%
/
98%
A
48
45
Starting current
Power supply
cord
Length
m
Type
Fuse capacity
A
1095*2
05*312
320*81
8*540
05*312
320*81
8*540
Inch
/
/
/
/
Kg
15
38
15
43
Liquid(mm)
OD×L
φ6.35×3600
φ6.35×3600
Gas(mm)
OD×L
φ12.7×3600
φ12.7×3600
ID×L
φ14×1100
φ14×1100
/
Rotary
/
Rotary
/
/
/
/
/
1990
/
1990
Throug
Axial-fl
ow fan
Throug
Axial-fl
ow fan
Plastic-
sealed
Iron
shell
sealed
Iron
shell
20
68
20
68
2×13
1×10
2×13
2×22
D×W×H
Type
Rated input
W
h-flow
or
250V 16A
1095*2
Type
Motor
/
/
Type
Fan-motor
/
3.15
Drain pipe (mm)
Motor
/
/
Net weight
Compresso
/
3.15
Dimension
Connection
pipe
98%
250V 16A
mm
Dimension
ASW-18A2/E#
Type
Rated input
Heat exchanger (Row×line)
Plastic-
W
h-flow
Refrigerant control
Capillary
Capillary
Freezed oil capacity
/
/
58
AUX air conditioner service manual
Refrigerant/Charge (g)
R22/1050
Protection equipment
/
Model
Item
Performance
Input
ASW-18B2/E#
Outdoor
/
Inner
ASW-H18B2/E#
Indoor
Outdoor
ASW-24B2/E#
Indoor
Outdoor
ASW-H24B2/E#
Indoor
Outdoor
Wall -mounted
Wall -mounted
Wall -mounted
Wall -mounted
Cooling capacity
Kw
5.3
5.3
7.0
7.0
Heating capacity
Kw
/
5.8
/
7.7
Dehumidifying
Kg/h
2.12
2.12
2.8
2.8
3
Air
circulation
Cooling
m /h
850
/
850
/
1000
/
1000
/
Heating
3
m /h
/
/
900
/
/
/
1050
/
Noise
lever
Cooling
dB
50
57
50
57
49
57
49
57
Heating
dB
/
/
50
57
/
/
49
571
Power-supply
φ--V--Hz
Rated power
consumption
Cooling
1/208-230V/60Hz
1/208-230V/60Hz
1/208-230V/60Hz
1/208-230V/60Hz
W
1920
1950
2550
2550
Heating
W
/
1900
/
2550
Rated
current
Cooling
A
8.8
9.0
11.8
11.8
Heating
A
/
8.8
/
11.8
Input
factor
Cooling
%
98%
98%
Heating
%
/
98%
/
98%
A
45
45
59
59
Starting current
Power supply
cord
Length
m
Type
Fuse capacity
A
Motor
/
250V 25A
/
/
250V 25A
3.15
/
3.15
/
1095*2
1095*2
05*312
800*30
0*690
1095*2
05*312
800*30
0*690
1095*2
05*312
800*30
0*690
05*312
800*30
0*690
Inch
/
/
/
/
/
/
/
/
Kg
15
46
15
48
15
50
15
51
Liquid(mm)
OD×L
φ6.35×3600
φ6.35×3600
φ9.52×3600
φ9.52×3600
Gas(mm)
OD×L
φ12.7×3600
φ12.7×3600
φ15.88×3600
φ15.88×3600
ID×L
φ14×1100
φ14×1100
φ14×1100
φ14×1100
/
Rotary
/
Rotary
/
Rotary
/
Rotary
/
/
/
/
/
/
/
/
/
1990
/
1990
/
2425
/
2425
Throug
Axial-fl
ow fan
Throug
Axial-fl
ow fan
Throug
Axial-fl
ow fan
Throug
Axial-fl
ow fan
Plastic-
sealed
Iron
shell
Plastic-
sealed
Iron
shell
Plastic-
sealed
Iron
shell
sealed
Iron
shell
20
68
20
68
30
68
30
68
2×13
2×30
2×13
2×30
2×16
2×26
2×16
2×26
D×W×H
Type
Rated input
W
Type
h-flow
or
250V 10A
/
/
Type
Motor
/
3.15
Drain pipe (mm)
Fan-motor
/
/
Net weight
Compresso
/
98%
3.15
Dimension
Connection
pipe
/
250V 16A
mm
Dimension
Inner
Indoor
Type
R22/1290
Type
Rated input
Heat exchanger (Row×line)
Plastic-
W
h-flow
h-flow
h-flow
Refrigerant control
Capillary
Capillary
Capillary
Capillary
Freezed oil capacity
/
/
/
/
R22/1480
R22/1750
R22/1830
R22/2130
Refrigerant/Charge (g)
Protection equipment
Rated Cooling
test condition
/
Inner
/
Inner
Indoor unit: DB:27℃, WB:19℃
59
/
Inner
/
Inner
Outdoor unit: DB:35℃, WB:24℃
AUX air conditioner service manual
Rated Heating
test condition
Indoor unit: DB:20℃, WB:------
Outdoor unit: DB:7℃, WB:6℃
Max. Cooling
test condition
Indoor unit: DB:32℃, WB:23℃
Outdoor unit: DB:43℃, WB:26℃
Max. Heating
test condition
Indoor unit: DB:27℃, WB:------
Outdoor unit: DB:24℃, WB:18℃
3、Parameter for R410 、E Series、208-230V/60HZ products、Cooling only type
ASW-09A2/E#R1
ASW-12A2/E#R1
ASW-18A2/E#R1
Model
Indoor
Outdoor
Indoor
Outdoor
Indoor
Outdoor
Item
Input
Performance
Type
Indoor
Outdoor
Wall -mounted
Wall -mounted
Wall -mounted
Wall -mounted
Cooling capacity
Kw
2.5
3.2
4.8
6.0
Heating capacity
Kw
/
/
/
/
Dehumidifying
Kg/h
1.0
1.0
2.4
2.4
3
460
/
520
/
850
/
1000
/
/
/
/
/
/
/
/
50
40
52
49
57
49
57
/
/
/
/
/
/
/
Air
circulation
Cooling
m /h
Heating
3
m /h
/
Noise
lever
Cooling
dB
38
Heating
dB
/
Power-supply
φ--V--Hz
Rated power
consumption
Cooling
1/208-230V/60Hz
1/208-230V/60Hz
1/208-230V/60Hz
1/208-230V/60Hz
W
820
1030
1600
2100
Heating
W
/
/
/
/
Rated
current
Cooling
A
4.0
4.7
7.1
9.5
Heating
A
/
/
/
/
Input
factor
Cooling
%
98%
98%
Heating
%
/
/
/
/
A
18
21
35
47.5
Starting current
Power supply
cord
Length
Dimension
A
3.15
mm
210*74
5*250
Inch
/
Kg
9.5
or
250V 10A
/
/
250V 16A
/
/
250V 16A
/
3.15
/
3.15
/
3.15
/
320*81
8*540
210*74
1095*2
05*312
320*81
8*540
1095*2
5*250
320*81
8*540
05*312
800*30
0*590
/
/
/
/
/
/
/
30
9.5
32
15
41
15
43
φ6.35×3600
φ6.35×3600
φ9.52×3600
Gas(mm)
OD×L
φ9.52×3600
φ9.52×3600
φ12.7×3600
φ15.88×3600
ID×L
φ14×780
φ14×780
φ14×1100
φ14×1100
Type
Rated input
W
/
Rotary
/
Rotary
/
Rotary
/
Rotary
/
/
/
/
/
/
/
/
/
800
/
1070
/
1450
/
2000
Axial-fl
ow fan
Throug
Axial-fl
ow fan
Throug
Axial-fl
ow fan
Throug
Axial-fl
ow fan
Iron
shell
Plastic-
Plasticsealed
Iron
shell
Plastic-
sealed
Iron
shell
sealed
Iron
shell
25
19
30
24
30
30
65
1×11
2×13
1×22
2×13
2×22
2×16
2×24
Throug
h-flow
Motor
/
φ6.35×3600
Type
Fan-motor
/
OD×L
Type
Motor
/
98%
Liquid(mm)
Drain pipe (mm)
Compresso
/
250V 10A
D×W×H
Net weight
Connection
pipe
m
Type
Fuse capacity
Dimension
ASW-24A2/E#R1
Type
Plasticsealed
Rated input
Heat exchanger (Row×line)
W
13
2×11
h-flow
h-flow
h-flow
Refrigerant control
Capillary
Capillary
Capillary
Capillary
Freezed oil capacity
/
/
/
/
R410a /580
R410a/910
R22/1120
R22/1250
Refrigerant/Charge (g)
Protection equipment
/
EXTERNAL
60
/
EXTERNAL
/
Inner
/
Inner
AUX air conditioner service manual
Rated Cooling
test condition
Indoor unit: DB:27℃, WB:19℃
Outdoor unit: DB:35℃, WB:24℃
Max. Cooling
test condition
Indoor unit: DB:32℃, WB:23℃
Outdoor unit: DB:43℃, WB:26℃
4、Parameter for R22 、M Series、115V/60HZ products
ASW-09A3/M
ASW-H09A3/M
Model
Indoor
Outdoor
Indoor
Outdoor
Item
Input
Performance
Type
Indoor
Outdoor
ASW-H12B3/M
Indoor
Outdoor
Wall -mounted
Wall -mounted
Wall -mounted
Wall -mounted
Cooling capacity
Kw
2.6
2.6
3.5
3.5
Heating capacity
Kw
/
2.8
/
3.95
Dehumidifying
Kg/h
0.77
0.77
1.1
1.1
3
Air
circulation
Cooling
m /h
460
/
460
/
550
/
550
/
Heating
3
m /h
/
/
460
/
/
/
550
/
Noise
lever
Cooling
dB
39
52
39
52
42
52
42
52
Heating
dB
/
/
39
52
/
/
42
52
Power-supply
φ--V--Hz
Rated power
consumption
Cooling
1/115V/60Hz
1/115V/60Hz
1/115V/60Hz
1/115V/60Hz
W
920
920
1330
1330
Heating
W
/
880
/
1360
Rated
current
Cooling
A
8.0
8.0
11.6
11.6
Heating
A
/
7.7
/
11.9
Input
factor
Cooling
%
98%
98%
Heating
%
/
98%
/
98%
A
45
45
58
58
Starting current
Power supply
cord
Length
m
A
Motor
/
/
/
/
/
/
/
/
3.15
/
3.15
/
180*82
180*82
0*280
320*81
8*540
180*82
0*280
320*81
8*540
180*82
0*280
320*81
8*540
0*280
320*81
8*540
Inch
/
/
/
/
/
/
/
/
Kg
10.5
30
10.5
31
11
33
11
35
Liquid(mm)
OD×L
φ6.35×3600
φ6.35×3600
φ6.35×3600
φ6.35×3600
Gas(mm)
OD×L
φ9.52×3600
φ9.52×3600
φ12.7×3600
φ12.7×3600
ID×L
φ14×780
φ14×780
φ14×780
φ14×780
/
Rotary
/
Rotary
/
Rotary
/
Rotary
/
/
/
/
/
/
/
/
/
877
/
877
/
1300
/
1300
Throug
Axial-fl
ow fan
Throug
Axial-fl
ow fan
Throug
Axial-fl
ow fan
Throug
Axial-fl
ow fan
Plastic-
sealed
Iron
shell
Plastic-
sealed
Iron
shell
Plastic-
sealed
Iron
shell
sealed
Iron
shell
19
25
19
25
19
35
19
35
2×16
1×11
2×16
1×11
2×16
2×22
2×16
2×22
D×W×H
Type
Type
Rated input
W
Type
h-flow
or
/
3.15
Drain pipe (mm)
Motor
/
/
Net weight
Fan-motor
98%
3.15
Dimension
Compresso
/
/
mm
Connection
pipe
/
Type
Fuse capacity
Dimension
ASW-12B3/M
Type
Rated input
Heat exchanger (Row×line)
Plastic-
W
h-flow
h-flow
h-flow
Refrigerant control
Capillary
Capillary
Capillary
Capillary
Freezed oil capacity
/
/
/
/
R22/700
R22/790
R22/820
R22/1110
Refrigerant/Charge (g)
Protection equipment
Rated Cooling
test condition
/
EXTERNAL
/
EXTERNAL
/
EXTERNAL
Indoor unit: DB:26.7℃, WB:19.4℃ Outdoor unit:
61
/
EXTERNAL
DB:35℃, WB:23.9℃
AUX air conditioner service manual
Rated Heating
test condition
Indoor unit: DB:21.1℃, WB: 15.6℃ Outdoor unit:
DB:8.3℃, WB:6.1℃
Max. Cooling
test condition
Indoor unit: DB:32.2℃, WB:222.8℃ Outdoor unit:
DB:43.3℃, WB:25.6℃
Max. Heating
test condition
Indoor unit: DB:26.7℃, WB:------
62
Outdoor unit: DB:23.9℃, WB:18.3℃
AUX air conditioner service manual
Section three
Introductions of the optional functions
1. Intelligent defrosting
The defrosting judgment basing on the variety of the indoor coil temperature is more precise than the
traditional one basing on the variety of the outdoor coil temperature. The former ensures the
defrosting precision in case of the mistaking defrosting function happen when there is no frost outdoor,
and henceforth enhances the average heating capacity so as to realize the energy saving function.
2. I feel
The location of the indoor sensor is displaced from the traditional air inlet side to the remote controller.
If only accompanying the human body, the remote controller will supervise the actual ambiance
temperature around the human body, and maintain the most comfortable temperature as the human
body can feel. With the function of double control, the temperature control function of the remote
controller realized the humanized indoor temperature. The digital intelligent human-inductive function
make you feel comfortable and salubrious wherever you are.
3. Negative ion
The basic theory of the negative ion generator is sourced from the phenomenon of the negative ion
product process undergoing between the line-level electricity and the net electrode. The produced
unbalanced electric field by the impact of the high-pressure electricity ionizes the passing air. The
ionized air with negative ion will pass the polarity filter unit for removing the positive ion and store
the negative ion. Usually, the quantity of the negative ion contained in the air will be cut off almost by
50 percents. The main function of the negative ion is for refreshing the air. More high concentration
ratio the negative ion is, the human body will feel more comfortable as being in the nature. The
negative ion concentration ratio of our generator is 1,000,000 /cm3.
4. The solid air supply (3-D wind)
The air guiding vanes on the horizontal and vertical directions are forced by the various electric
step-motors. They can swing independently, and also can swing together, which enlarged the
air-supplying angle and balanced the indoor temperature properly.
63
AUX air conditioner service manual
5. Music reminding button
Every press on the button derivates the reminding music which is same as the functions of the buttons
on the mobile phone.
6. The specification of the sterilization function
The dust particles accumulated on the filter net may cause the second pollution to the filter after a
certain period in use, which seriously affects the quality of the air. By using the sterilization filter, the
second pollution can be avoided after a certain period in use, and guaranty the favorable air quality.
64
AUX air conditioner service manual
Chapter 3
Exploded views of AUX air-conditioner
Section one
E series products
1. ASW-H09A2/ET
Indoor unit exploded view
68
AUX air conditioner service manual
No
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
Detailed part list of ASW-H09A2/ET indoor unit
Chinese Name
Name
Material
面板组件
Panel
杀菌过滤网
Anti-bacterial Filter
维 C 防螨过滤网
Vitamin-C & Anti-mites Filter
过滤网组件
Filter
螺钉盖
Screw cover
中框盖
Cover of medium frame
中框组件
Medium frame
导风门
Horizontal air blade
导风叶片
Vertical air blade
导风架
Air blade holder
步进电机组件
Step motor
贯流风叶组件
Indoor fan
橡胶轴承座
Rubber bearing
蒸发器左支架
Left plastic crutch for evaporator
蒸发器总成
Evaporator
底座组件
Chassis
挂板组件
Mounting plate
管路压板
Tube clamp plate
塑封电机组件
Indoor fan motor
电机盖
Cover for indoor fan motor
电控盒
Electric controller box
变压器
Transformer
室内传感器
Plastic temperature sensor
主控板
Main PCB
内盘传感器
Copper temperature sensor
遥控器接收座
Signal receiver holder for
Remote controller
温控探头支架
Temperature sensor holder
接收板
Receiver board
端子板
Terminal board
负离子发生器
Negative ion generator
连接线
Connection cable
电源连接线
Interconnection cord
电源线
Power supply cord with plug
指示灯座
Indication lamp holder
显示板
Display board
指示灯板
Indication lamp board
遥控器
Remote controller
69
Number
1
2
2
2
3
1
1
1
2
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
AUX air conditioner service manual
Outdoor unit exploded view
70
AUX air conditioner service manual
No
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
Detailed part list of ASW-H09A2/ET outdoor unit
Chinese Name
Name
Material
面板网罩
Steel grille
面板组件
Front panel
顶盖板
Top cover board
轴流风叶
Outdoor fan
室外电机
Outdoor fan motor
电机架
Motor bracket
冷凝器组件
Condenser assembly
冷凝器进气管
Condenser gas inlet tube
毛细管组件
Capillary assembly
后钢丝网罩
Backside steel grille
电器盖板
Handle
右侧板
Right-side plate
电容抱攀
Capacitor clamp
风机电容
Fan motor capacitor
压缩机电容
Compressor capacitor
端子板
Terminal board
电器架
Electrical holding plate
隔风立板
Partition plate
四通阀线圈
Electromagnetic loop
四通阀管路组件
Four-way valve and capillary
assembly
压缩机连接线
Compressor connection cord
压缩机接地线
Compressor grounding cord
电器罩
Compressor terminal cover
过载保护器
Over-load protector
压缩机
Compressor
截止阀组件 A
Liquid valve
截止阀组件 B
Gas valve
阀板
Valve plate
底盘组件
Chassis
71
Number
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
AUX air conditioner service manual
2. ASW-H09A2/EC
Indoor unit exploded view
72
AUX air conditioner service manual
No
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
Detailed part list of ASW-H09A2/ET indoor unit
Chinese Name
Name
Material
面板组件
Panel
杀菌过滤网
Anti-bacterial Filter
维 C 防螨过滤网
Vitamin-C & Anti-mites Filter
过滤网组件
Filter
螺钉盖
Screw cover
中框盖
Cover of Medium frame
中框组件
Medium frame
导风门
Horizontal air blade
导风叶片
Vertical air blade
导风架
Air blade holder
步进电机组件
Step motor
贯流风叶组件
Indoor fan
橡胶轴承座
Rubber bearing
蒸发器左支架
Left plastic crutch for evaporator
蒸发器总成
Evaporator
底座组件
Chassis
挂板组件
Mounting plate
管路压板
Tube clamp plate
塑封电机组件
Indoor fan motor
电机盖
Cover for indoor fan motor
电控盒
Electric controller box
变压器
Transformer
室内传感器
Plastic temperature sensor
主控板
Main PCB
内盘传感器
Copper temperature sensor
遥控器接收座
Signal receiver holder for
Remote controller
温控探头支架
Temperature sensor holder
接收板
Receiver board
端子板
Terminal board
负离子发生器
Negative ion generator
连接线
Connection cable
电源连接线
Interconnection cord
电源线
Power supply cord with plug
指示灯座
Indication lamp holder
显示板
Display board
遥控器
Remote controller
73
Number
1
2
2
2
3
1
1
1
2
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
AUX air conditioner service manual
Outdoor unit exploded view
74
AUX air conditioner service manual
No
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
Detailed part list of ASW-H09A2/EC outdoor unit
Chinese Name
Name
Material
面板网罩
Steel grille
面板组件
Front panel
顶盖板
Top cover board
轴流风叶
Outdoor fan
室外电机
Outdoor fan motor
电机架
Motor bracket
冷凝器组件
Condenser assembly
冷凝器进气管
Condenser gas inlet tube
毛细管组件
Capillary assembly
后钢丝网罩
Backside steel grille
电器盖板
Handle
右侧板
Right-side plate
电容抱攀
Capacitor clamp
风机电容
Fan motor capacitor
压缩机电容
Compressor capacitor
端子板
Terminal board
电器架
Electrical holding plate
隔风立板
Partition plate
四通阀线圈
Electromagnetic loop
四通阀管路组件
Four-way valve and capillary
assembly
压缩机连接线
Compressor connection cord
压缩机接地线
Compressor grounding cord
电器罩
Compressor terminal cover
过载保护器
Over-load protector
压缩机
Compressor
截止阀组件 A
Liquid valve
截止阀组件 B
Gas valve
阀板
Valve plate
底盘组件
Chassis
75
Number
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
AUX air conditioner service manual
3. ASW-H12A2/ET
Indoor unit exploded view
76
AUX air conditioner service manual
No
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
Detailed part list of ASW-H12A2/ET indoor unit
Chinese Name
Name
Material
面板组件
Panel
杀菌过滤网
Anti-bacterial Filter
维 C 防螨过滤网
Vitamin-C & Anti-mites Filter
过滤网组件
Filter
螺钉盖
Screw cover
中框盖
Cover of medium frame
中框组件
Medium frame
导风门
Horizontal air blade
导风叶片
Vertical air blade
导风架
Air blade holder
步进电机组件
Step motor
贯流风叶组件
Indoor fan
橡胶轴承座
Rubber bearing
蒸发器左支架
Left plastic crutch for evaporator
蒸发器总成
Evaporator
底座组件
Chassis
挂板组件
Mounting plate
管路压板
Tube clamp plate
塑封电机组件
Indoor fan motor
电机盖
Cover for indoor fan motor
电控盒
Electric controller box
变压器
Transformer
室内传感器
Plastic temperature sensor
主控板
Main PCB
内盘传感器
Copper temperature sensor
遥控器接收座
Signal receiver holder for
Remote controller
温控探头支架
Temperature sensor holder
接收板
Receiver board
端子板
Terminal board
负离子发生器
Negative ion generator
连接线
Connection cable
电源连接线
Interconnection cord
电源线
Power supply cord with plug
指示灯座
Indication lamp holder
显示板
Display board
指示灯板
Indication lamp board
遥控器
Remote controller
77
Number
1
2
2
2
3
1
1
1
2
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
AUX air conditioner service manual
Outdoor unit exploded view
78
AUX air conditioner service manual
No
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
Detailed part list of ASW-H12A2/ET outdoor unit
Chinese Name
Name
Material
面板网罩
Steel grille
面板组件
Front panel
顶盖板
Top cover board
轴流风叶
Outdoor fan
室外电机
Outdoor fan motor
电机架
Motor bracket
冷凝器组件
Condenser assembly
冷凝器进气管
Condenser gas inlet tube
毛细管组件
Capillary assembly
后钢丝网罩
Backside steel grille
电器盖板
Handle
右侧板
Right-side plate
电容抱攀
Capacitor clamp
风机电容
Fan motor capacitor
压缩机电容
Compressor capacitor
端子板
Terminal board
电器架
Electrical holding plate
隔风立板
Partition plate
四通阀线圈
Electromagnetic loop
四通阀管路组件
Four-way valve and capillary
assembly
压缩机连接线
Compressor connection cord
压缩机接地线
Compressor grounding cord
电器罩
Compressor terminal cover
过载保护器
Over-load protector
压缩机
Compressor
截止阀组件 A
Liquid valve
截止阀组件 B
Gas valve
阀板
Valve plate
底盘组件
Chassis
79
Number
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
AUX air conditioner service manual
4. ASW-H12A2/EC
Indoor unit exploded view
80
AUX air conditioner service manual
No
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
Detailed part list of ASW-H12A42EC indoor unit
Chinese Name
Name
Material
面板组件
Panel
杀菌过滤网
Anti-bacterial Filter
维 C 防螨过滤网
Vitamin-C & Anti-mites Filter
过滤网组件
Filter
螺钉盖
Screw cover
中框盖
Cover of Medium frame
中框组件
Medium frame
导风门
Horizontal air blade
导风叶片
Vertical air blade
导风架
Air blade holder
步进电机组件
Step motor
贯流风叶组件
Indoor fan
橡胶轴承座
Rubber bearing
蒸发器左支架
Left plastic crutch for evaporator
蒸发器总成
Evaporator
底座组件
Chassis
挂板组件
Mounting plate
管路压板
Tube clamp plate
塑封电机组件
Indoor fan motor
电机盖
Cover for indoor fan motor
电控盒
Electric controller box
变压器
Transformer
室内传感器
Plastic temperature sensor
主控板
Main PCB
内盘传感器
Copper temperature sensor
遥控器接收座
Signal receiver holder for Remote
controller
温控探头支架
Temperature sensor holder
接收板
Receiver board
端子板
Terminal board
负离子发生器
Negative ion generator
连接线
Connection cable
电源连接线
Interconnection cord
电源线
Power supply cord with plug
指示灯座
Indication lamp holder
显示板
Display board
遥控器
Remote controller
81
Number
1
2
2
2
3
1
1
1
2
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
AUX air conditioner service manual
Outdoor unit exploded view
82
AUX air conditioner service manual
No
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
Detailed part list of ASW-H12A2/EC outdoor unit
Chinese Name
Name
Material
面板网罩
Steel grille
面板组件
Front panel
顶盖板
Top cover board
轴流风叶
Outdoor fan
室外电机
Outdoor fan motor
电机架
Motor bracket
冷凝器组件
Condenser assembly
冷凝器进气管
Condenser gas inlet tube
毛细管组件
Capillary assembly
后钢丝网罩
Backside steel grille
电器盖板
Handle
右侧板
Right-side plate
电容抱攀
Capacitor clamp
风机电容
Fan motor capacitor
压缩机电容
Compressor capacitor
端子板
Terminal board
电器架
Electrical holding plate
隔风立板
Partition plate
四通阀线圈
Electromagnetic loop
四通阀管路组件
Four-way valve and capillary
assembly
压缩机连接线
Compressor connection cord
压缩机接地线
Compressor grounding cord
电器罩
Compressor terminal cover
过载保护器
Over-load protector
压缩机
Compressor
截止阀组件 A
Liquid valve
截止阀组件 B
Gas valve
阀板
Valve plate
底盘组件
Chassis
83
Number
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
AUX air conditioner service manual
5. ASW-H18B2/ET
Indoor unit exploded view
84
AUX air conditioner service manual
No
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
Detailed part list of ASW-H18B2/ET indoor unit
Chinese Name
Name
Material
面板组件
Panel
大扁头自攻螺钉
Screw
电控盒盖
Cover of medium frame
螺钉盖
Screw cover
大扁头自攻螺钉
Screw
导风门 A
Horizontal air blade A
导风门 B
Horizontal air blade B
导风门连杆
Connection-pole of horizontal air
blade
步进电机组件
Step motor
十字槽自攻螺钉
Screw
大扁头自攻螺钉
Screw
压线板
Wiring clamping cover
导风架组件
Air blade holder
控制器总成
Electric controller assembly
抽头塑封电机组件
Indoor fan motor
管路压攀
Pipe clamp
挂板组件
Mounting plate
底座组件
Chassis
贯流风叶组件
Indoor fan
橡胶轴承座组件
Rubber bearing
蒸发器总成
Evaporator assembly
蒸发器支架
Left plastic crutch for evaporator
中框组件
Medium frame
过滤网
Filter
85
Number
1
9
1
3
3
1
1
1
1
1
12
1
1
1
1
1
1
1
1
1
1
1
1
2
AUX air conditioner service manual
Outdoor unit exploded view
86
AUX air conditioner service manual
No
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
Detailed part list of ASW-H18B2/ET outdoor unit
Chinese Name
Name
Material
左侧支撑板
Left-side supporting plate
钢丝网罩
Steel grille
大扁头自攻螺钉
Screw
顶盖板
Top cover board
大面板
Front panel
冷凝器总成
Condenser assembly
右侧板
Right-side panel plate
小挖手
Handle
电容抱攀
Capacitor clamp
压缩机电容
Compressor capacitor
电机电容
Fan motor capacitor
压线板
Wiring clamping cover
电器架
Electrical holding plate
五位端子板
Terminal board
隔风立板
Partition plate
压缩机
Compressor
毛细管组件
Capillary assembly
四通阀管路组件
Four-way valve assembly
截止阀组件 Dg4
Liquid valve Dg4
截止阀组件 Dg10
Gas valve Dg10
底盘组件
Chassis
十字槽自攻螺钉
Screw
阀板
Valve plate
轴流风叶
Outdoor fan
电机架
Motor bracket
室外风叶电机
Outdoor fan motor
十字槽盘头螺钉
Screw
87
Number
1
1
4
1
1
1
1
2
1
1
1
1
1
1
1
1
1
1
1
1
1
4
1
1
1
1
4
AUX air conditioner service manual
6. ASW-H24B2/ET
Indoor unit exploded view
88
AUX air conditioner service manual
No
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
Detailed part list of ASW-H24B2/ET indoor unit
Chinese Name
Name
Material
面板组件
Panel
大扁头自攻螺钉
Screw
电控盒盖
Cover of medium frame
螺钉盖
Screw cover
大扁头自攻螺钉
Self-drill screw
导风门 A
Horizontal air blade A
导风门 B
Horizontal air blade B
导风门连杆
Connection-pole of horizontal
air blade
步进电机组件
Step motor
十字槽自攻螺钉
Screw
大扁头自攻螺钉
Screw
压线板
Wiring clamping cover
导风架组件
Air blade holder
控制器总成
Electric controller assembly
抽头塑封电机组件
Indoor fan motor
管路压攀
Pipe clamp
挂板组件
Mounting plate
底座组件
Chassis
贯流风叶组件
Indoor fan
橡胶轴承座组件
Rubber bearing
蒸发器总成
Evaporator assembly
蒸发器支架
Left plastic crutch for evaporator
中框组件
Medium frame
过滤网
Filter
89
Number
1
9
1
3
3
1
1
1
1
1
12
1
1
1
1
1
1
1
1
1
1
1
1
2
AUX air conditioner service manual
Outdoor unit exploded view
90
AUX air conditioner service manual
No
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
Detailed part list of ASW-H24B2/ET outdoor unit
Chinese Name
Name
Material
左侧支撑板
Left-side supporting plate
钢丝网罩
Steel grille
大扁头自攻螺钉
Screw
顶盖板
Top cover board
大面板
Front panel
冷凝器总成
Condenser assembly
右侧板
Right-side panel plate
小挖手
Handle
电容抱攀
Capacitor clamp
压缩机电容
Compressor capacitor
单极交流接触器
AC Contactor
电机电容
Fan motor capacitor
压线板
Wiring clamping cover
电器架
Electrical holding plate
五位端子板
Terminal board
隔风立板
Partition plate
压缩机
Compressor
毛细管组件
Capillary assembly
四通阀管路组件
Four-way valve assembly
截止阀组件 Dg8
Liquid valve Dg8
截止阀组件 Dg13
Gas valve Dg13
底盘组件
Chassis
十字槽自攻螺钉
Screw
阀板
Valve plate
轴流风叶
Outdoor fan
电机架
Motor bracket
室外风叶电机
Outdoor fan motor
十字槽盘头螺钉
Screw
91
Number
1
1
4
1
1
1
1
2
1
1
1
1
1
1
1
1
1
1
1
1
1
1
4
1
1
1
1
4
AUX air conditioner service manual
Section two
H series products
1. ASW-H09A2/HSF
Indoor unit exploded view
92
AUX air conditioner service manual
No
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
Detailed part list of ASW-H09A2/HSF indoor unit
Chinese Name
Name
Material
面板组件
Panel
过滤网组件
Filter
电器盖板
Cover of medium frame
中框盖
Medium frame
导风门
Horizontal air blade
导风叶片
Vertical air blade
导风架
Air blade holder
步进电机组件
Step motor
贯流风叶组件
Indoor fan
橡胶轴承座
Rubber bearing
蒸发器左支架
Left plastic crutch for evaporator
蒸发器总成
Evaporator assembly
底座组件
Chassis
挂板组件
Mounting plate
管路压板
Tube clamp plate
塑封电机组件
Indoor fan motor
电控盒
Electric controller box
变压器
Transformer
室内传感器
Plastic temperature sensor
主控板
Main PCB
内盘传感器
Copper temperature sensor
遥控器接收座
Signal receiver holder for
Remote controller
温控探头支架
Temperature sensor holder
接收板
Receiver board
端子板
Terminal board
负离子发生器
Negative ion generator
Optional
连接线
Connection cable
电源连接线
Interconnection cord
电源线
Power supply cord with plug
显示灯板
Display board
遥控器
Remote controller
“I feel” function
optional
93
Number
1
2
1
1
1
12
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
AUX air conditioner service manual
Outdoor unit exploded view
94
AUX air conditioner service manual
No
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
Detailed part list of ASW-H09A2/HSF outdoor unit
Chinese Name
Name
Material
面板网罩
Steel grille
面板组件
Front panel
顶盖板
Top cover board
轴流风叶
Outdoor fan
室外电机
Outdoor fan motor
电机架
Motor bracket
冷凝器组件
Condenser assembly
冷凝器进气管
Condenser gas inlet tube
毛细管组件
Capillary assembly
后钢丝网罩
Backside steel grille
电器盖板
Handle
右侧板
Right-side plate
电容抱攀
Capacitor clamp
风机电容
Fan motor capacitor
压缩机电容
Compressor capacitor
端子板
Terminal board
电器架
Electrical holding plate
隔风立板
Partition plate
四通阀线圈
Electromagnetic loop
四通阀管路组件
Four-way valve and capillary
assembly
压缩机连接线
Compressor connection cord
压缩机接地线
Compressor grounding cord
电器罩
Compressor terminal cover
过载保护器
Over-load protector
压缩机
Compressor
截止阀组件 A
Liquid valve Dg4
截止阀组件 B
Gas valve Dg8
阀板
Valve plate
底盘组件
Chassis
95
Number
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
AUX air conditioner service manual
2. ASW-H09A2/HSL
Indoor unit exploded view
96
AUX air conditioner service manual
No
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
Detailed part list of ASW-H09A2/HSL indoor unit
Chinese Name
Name
Material
面板组件
Panel
过滤网组件
Filter
电器盖板
Cover of medium frame
中框盖
Medium frame
导风门
Horizontal air blade
导风叶片
Vertical air blade
导风架
Air blade holder
步进电机组件
Step motor
贯流风叶组件
Indoor fan
橡胶轴承座
Rubber bearing
蒸发器左支架
Left plastic crutch for evaporator
蒸发器总成
Evaporator assembly
底座组件
Chassis
挂板组件
Mounting plate
管路压板
Tube clamp plate
塑封电机组件
Indoor fan motor
电控盒
Electric controller box
变压器
Transformer
室内传感器
Plastic temperature sensor
主控板
Main PCB
内盘传感器
Copper temperature sensor
遥控器接收座
Signal receiver holder for Remote
controller
温控探头支架
Temperature sensor holder
接收板
Receiver board
端子板
Terminal board
负离子发生器
Negative ion generator
Optional
连接线
Connection cable
电源连接线
Interconnection cord
电源线
Power supply cord with plug
显示灯板
Display board
遥控器
Remote controller
97
Number
1
2
1
1
1
12
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
AUX air conditioner service manual
Outdoor unit exploded view
98
AUX air conditioner service manual
No
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
Detailed part list of ASW-H09A2/HSL outdoor unit
Chinese Name
Name
Material
面板网罩
Steel grille
面板组件
Front panel
顶盖板
Top cover board
轴流风叶
Outdoor fan
室外电机
Outdoor fan motor
电机架
Motor bracket
冷凝器组件
Condenser assembly
冷凝器进气管
Condenser gas inlet tube
毛细管组件
Capillary assembly
后钢丝网罩
Backside steel grille
电器盖板
Handle
右侧板
Right-side plate
电容抱攀
Capacitor clamp
风机电容
Fan motor capacitor
压缩机电容
Compressor capacitor
端子板
Terminal board
电器架
Electrical holding plate
隔风立板
Partition plate
四通阀线圈
Electromagnetic loop
四通阀管路组件
Four-way valve and capillary
assembly
压缩机连接线
Compressor connection cord
压缩机接地线
Compressor grounding cord
电器罩
Compressor terminal cover
过载保护器
Over-load protector
压缩机
Compressor
截止阀组件 A
Liquid valve Dg4
截止阀组件 B
Gas valve Dg8
阀板
Valve plate
底盘组件
Chassis
99
Number
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
AUX air conditioner service manual
3. ASW-H09A2/HS
Indoor unit exploded view
100
AUX air conditioner service manual
No
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
Detailed part list of ASW-H09A2/HS indoor unit
Chinese Name
Name
Material
面板组件
Panel
过滤网组件
Filter
电器盖板
Cover of medium frame
中框盖
Medium frame
导风门
Horizontal air blade
导风叶片
Vertical air blade
导风架
Air blade holder
步进电机组件
Step motor
贯流风叶组件
Indoor fan
橡胶轴承座
Rubber bearing
蒸发器左支架
Left plastic crutch for evaporator
蒸发器总成
Evaporator
底座组件
Chassis
挂板组件
Mounting plate
管路压板
Tube clamp plate
塑封电机组件
Indoor fan motor
电控盒
Electric controller box
变压器
Transformer
室内传感器
Plastic temperature sensor
主控板
Main PCB
内盘传感器
Copper temperature sensor
遥控器接收座
Signal receiver holder for Remote
controller
温控探头支架
Temperature sensor holder
接收板
Receiver board
端子板
Terminal board
负离子发生器
Negative ion generator
连接线
Connection cable
电源连接线
Interconnection cord
电源线
Power supply cord with plug
显示灯板
Display board
遥控器
Remote controller
101
Number
1
2
1
1
1
12
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
AUX air conditioner service manual
Outdoor unit exploded view
102
AUX air conditioner service manual
No
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
Detailed part list of ASW-H09A2/HS outdoor unit
Chinese Name
Name
Material
面板网罩
Steel grille
面板组件
Front panel
顶盖板
Top cover board
轴流风叶
Outdoor fan
室外电机
Outdoor fan motor
电机架
Motor bracket
冷凝器组件
Condenser assembly
冷凝器进气管
Condenser gas inlet tube
毛细管组件
Capillary assembly
后钢丝网罩
Backside steel grille
电器盖板
Handle
右侧板
Right-side plate
电容抱攀
Capacitor clamp
风机电容
Fan motor capacitor
压缩机电容
Compressor capacitor
端子板
Terminal board
电器架
Electrical holding plate
隔风立板
Partition plate
四通阀线圈
Four-way valve loop
四通阀管路组件
Four-way valve and capillary
assembly
压缩机连接线
Compressor connection cord
压缩机接地线
Compressor grounding cord
电器罩
Compressor terminal cover
过载保护器
Over-load protector
压缩机
Compressor
截止阀组件 A
Liquid valve
截止阀组件 B
Gas valve
阀板
Valve plate
底盘组件
Chassis
103
Number
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
AUX air conditioner service manual
4. ASW-H18B2/HS
Indoor unit exploded view
104
AUX air conditioner service manual
No
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
Detailed part list of ASW-H18B2/HS indoor unit
Chinese Name
Name
Material
过滤网组件
Filter
螺钉盖
Screw cover
中框组件
Medium frame
导风门
Horizontal air blade
导风叶片
Vertical air blade
导风架
Air blade holder
蒸发器左支架
Left plastic crutch for evaporator
蒸发器总成
Evaporator
橡胶轴承座
Rubber bearing
贯流风叶
indoor fan
底座组件
Chassis
挂板组件
Mounting plate
管路压攀
Pipe clamp
塑封电机
Indoor fan motor
电控盒
Electric controller box
变压器
Transformer
端子板
Terminal board
主控板 A
Main PCB
步进电机组件
Step motor
电控盒盖
Cover for electric controller box
指示灯座
Indication lamp holder
显示板
Display board
面板组件
Panel
显示灯板
Display board cover
105
Number
2
3
1
1
14
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
AUX air conditioner service manual
Outdoor unit exploded view
106
AUX air conditioner service manual
No
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
Detailed part list of ASW-H18B2/HS outdoor unit
Chinese Name
Name
Material
左侧支撑板
Left-side supporting plate
钢丝网罩
Steel grille
大扁头自攻螺钉
Screw
顶盖板
Top cover plate
大面板
Front panel
冷凝器总成
Condenser assembly
右侧板
Right-side plate
小挖手
Handle
电容抱攀
Capacitor clamp
压缩机电容
Compressor capacitor
风机电容
Fan motor capacitor
压线盖
Wiring cover
电器架
Electrical holding plate
五位端子板
Terminal board
隔风立板组件
Partition plate
压缩机组件
Compressor
毛细管管路组件
Capillary assembly
四通阀管路组件
Four-way valve and capillary
assembly
截止阀组件 Dg4
Liquid valve
截止阀组件 Dg10-1
Gas valve
底盘组件
Chassis
十字槽凹穴六角头自攻
Screw and cushion assembly
螺钉和平垫圈组合件
阀板
Valve plate
轴流风叶
Outdoor fan
电机架
Motor bracket
室外风叶电机组件
Outdoor fan motor
十字槽盘头自攻螺钉
Screw
107
Number
1
1
40
1
1
1
1
2
1
1
1
1
1
1
1
1
1
1
1
1
1
4
1
1
1
1
4
AUX air conditioner service manual
5. ASW-H24B2/HS
Indoor unit exploded view
108
AUX air conditioner service manual
No
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
Detailed part list of ASW-H24B2/HS indoor unit
Chinese Name
Name
Material
过滤网组件
Filter
螺钉盖
Screw cover
中框组件
Medium frame
导风门
Horizontal air blade
导风叶片
Vertical air blade
导风架
Air blade holder
蒸发器左支架
Left plastic crutch for evaporator
蒸发器总成
Evaporator
橡胶轴承座
Rubber bearing
贯流风叶
Indoor fan
底座组件
Chassis
挂板组件
Mounting plate
管路压攀
Pipe clamp
塑封电机
Indoor fan motor
电控盒
Electric controller box
变压器
Transformer
端子板
Terminal board
主控板 A
Main PCB
步进电机组件
Step motor
电控盒盖
Cover for electric controller box
指示灯座
Indication lamp holder
显示板
Display board
面板组件
Panel
显示灯板
Display board cover
109
Number
2
3
1
1
14
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
AUX air conditioner service manual
Outdoor unit exploded view
110
AUX air conditioner service manual
No
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
Detailed part list of ASW-H24B2/HS outdoor unit
Chinese Name
Name
Material
左侧支撑板
Left-side supporting plate
钢丝网罩
Steel grille
大扁头自攻螺钉
Screw
顶盖板
Top cover plate
大面板
Front panel
冷凝器总成
Condenser assembly
右侧板
Right-side plate
小挖手
Handle
电容抱攀
Capacitor clamp
压缩机电容
Compressor capacitor
单级交流接触器
AC Connector
风机电容
Fan motor capacitor
压线盖
Wiring clamping cover
电器架
Electrical holding plate
五位端子板
Terminal board
隔风立板组件
Partition plate
压缩机组件
Compressor
毛细管管路组件
Capillary assembly
四通阀管路组件
Four-way valve and capillary
assembly
截止阀组件 Dg8
Liquid valve
截止阀组件 Dg13
Gas valve
底盘组件
Chassis
十字槽凹穴六角头自攻螺 Screw and cushion assembly
钉和平垫圈组合件
阀板
Valve plate
轴流风叶
Outdoor fan
电机架
Motor bracket
室外风叶电机组件
Outdoor fan motor
十字槽盘头自攻螺钉
Screw
111
Number
1
1
40
1
1
1
1
2
1
1
1
1
1
1
1
1
1
1
1
1
1
1
4
1
1
1
1
4
AUX air conditioner service manual
Section 3
Exploded View of M Series (9000-12000Btu/h)
1. Indoor unit exploded view
112
AUX air conditioner service manual
Detailed part list of M series indoor unit
No
Name of part
Remark
1
Hanging board assembly
2
Chassis
3
Clamping prop for tube line
4
Bearing for air leaves
5
Through-flow fan leaves
6
Plastic-sealed electric motor
7
Left-hand propping holder for vaporizer
8
Vaporizer assembly
9
Light holder for indicator
10
Wind guide board
11
Step-by-step electric motor
12
Water-draining tube assembly
13
Louver
14
Inner frame
15
Cover for electric control box
16
Filtering net assembly
17
Panel
18
Transformer
19
Terminal board
20
Main-control board
21
Electric control box
22
Clamping plate for power connection line
23
Power line
24
Power connection line
25
Remote control
113
AUX air conditioner service manual
2. Outdoor unit exploded view
114
AUX air conditioner service manual
Detailed part list of the outdoor unit (Cooling only Type)
No
Name of part
remark
1
Top cover
2
Cover for electric unit
3
Right-hand board
4
Condenser assembly
5
Holder for electric motor
6
Outdoor electric motor
7
Axial-flow wind leaves
8
Holder for wiring
9
Capacitor for compressor
10
Capacitor for electric motor
11
Terminal board
12
Clamping plate for power connection line
13
Panel
14
Net for panel
15
Chassis assembly
16
Valve panel
18
Wind-fending standing board
19
Compressor
20
Compressor assembly
21
Capillary assembly
115
AUX air conditioner service manual
116
AUX air conditioner service manual
Detailed part list of the outdoor unit (Heat pump Type)
No
Name of part
remark
1
Top cover
2
Cover for electric unit
3
Right-hand board
4
Condenser assembly
5
Holder for electric motor
6
Outdoor electric motor
7
Axial-flow wind leaves
8
Holder for wiring
9
Capacitor for compressor
10
Capacitor for electric motor
11
Terminal board
12
Clamping plate for power connection line
13
Panel
14
Net for panel
15
Chassis assembly
16
Valve panel
18
Wind-fending standing board
19
Compressor
20
Four-way valve assembly
21
Capillary assembly
117
AUX air conditioner service manual
Chapter 4
The disassembly and the relating attention issues to the part of
AUX product
Section one
the disassembly and the relating attention issues to the series
products of 9000BTU~12000BTU
Attention: Turn off the air-conditioner and pull out the plug of the power supply before the
service.
1. Indoor unit:
No.
Part
Panel
1
1)
2)
3)
4)
5)
Operation Process
Turn off the air-conditioner and cut off
the power supply;
Tear the adhesive tape sticking to the
panel.
Hold the handles at both sides of the
panel and push upward to have it slip
out;
Grasp the both sides of the panel and
push upward;
Turn the upper board by 90°and unload
it from the connecting pole carefully;
6) Take out the filter from the right and left
side.
7) Screw off the bolts on the electrical box
cover and unload the box cover;
8) Screw off the 5 bolts (for 1Hp AC) or 8
bolts (for 1.5Hp AC) on the medium
frame;
9) Hold the both sides of the medium
frame and open it gently;
10) Turn up the medium frame by about
90°;
11) Offload the medium frame once hearing
the crack sound;
118
Remark
AUX air conditioner service manual
No.
2
Part
Operation Process
Electrical
1) Do No. “1” firstly;
component 2) Pull out all tie-in connecting with PCB
and the temperature sensor, etc.;
3) Screw off the screws and bolts as
indicated in the picture. Untie the
outdoor unit’s interconnection cord and
power supply cord from the terminal of
the electrical box.
4) If the main PCB board is loosed by
chance, remove it away;
3
Water
draining
tank
4
Evaporator 1) Do No.”1” , “2” and “3” firstly;
1) Do No.”1” and “2” firstly, offload the
water drainage soft tube;
2) Offload the water draining tank from
chassis and take out the electrical
components.
2) Offload the connecting pipe;
3) Offload the tube clip at the rear;
4) Screw off the bolts at the right and left
side;
5) Lift up the evaporator, and draw it out
from the indoor unit;
5
Indoor fan
Fan motor
1) Screw off one bolt from the motor
cover, and remove the motor cover;
2) Offload the motor from the fan;
3) Offload the fan from bearing;
119
Remark
AUX air conditioner service manual
2. Outdoor unit:
No.
Part
1
General
operation
Operation Process
1) Screw off one fastening bolt from the
electrical box cover, and offload the
box cover;
2) Pull out the interconnection cord from
the electrical box;
3) Screw off the five fastening bolts from
the cover board, and offload the board;
Screw the six fastening bolts from the
front panel, and offload the front
panel;
4) Screw off the fastening bolts from the
electrical assembly;
5) Screw off the eight fastening bolts and
offload the outer frame;
2
Outdoor
fan motor
1) Do No. “1” firstly;
2) Screw off the fastenings screws
clockwise.
3) Offload the fan.
4) Screw off the four fastening bolts and
offload the fan motor;
5) Screw off the two fastening bolts and
offload the fan motor bracket.
120
Remark
AUX air conditioner service manual
No.
3
Part
Condenser
Operation Process
1) Do No.”1” and “2” firstly;
2) Screw off the two fastening bolts;
3) Weld off the inlet and outlet tube;
4) Offload the condenser.
4
Compressor 1) Do No.”1” , “2”and “3” firstly;
2) Open the cover of compressor, release
the connection cord.
3) Weld off the inlet and outlet tube;
4) Screw off the three screws;
5) Offload the compressor.
121
Remark
AUX air conditioner service manual
Section Two
the disassembly and the relating attention issues to the series
product of 18000BTU~24000BTU
Attention: Turn off the air-conditioner and pull out the plug of the power supply before the
service.
2. Indoor unit:
No.
Part
1
Front
panel
Operation Process
1) Turn off the air-conditioner and cut off
the power supply;
2) Remove the adhesive tape sticking to
the panel.
4) Hold the handles at both sides of the
panel and push upward to have it slip
out;
5) Grasp the both sides of the panel and
push upward;
6) Turn the upper board by 90°and unload
it from the connecting pole carefully;
7) Take out the filter from the right and left
side.
8) Screw off the bolts on the electrical box
cover and unload the box cover;
9) Screw off the six bolts on the medium
frame;
10) Hold the both sides of the medium
frame and open it gently;
11) Turn up the medium frame by about
90°;
12) Offload the medium frame once hearing
the crack sound;
122
Remark
AUX air conditioner service manual
No.
2
Part
Operation Process
Electrical
1) Do No. “1” firstly;
component 2) Pull out all tie-in connecting with PCB
and the temperature sensor, etc.;
3) Screws off the screws and bolts at the
three positions indicated in the picture.
Untie the outdoor unit’s interconnection
cord and power supply cord from the
terminal of the electrical box.
4) If the main PCB board is loosed by
chance, remove it away;
3
Water
draining
tank
4
Evaporator 1)
2)
3)
4)
5
Indoor fan 1) Offload the motor from the indoor fan;
and fan 2) Offload the indoor fan from bearing;
motor
1) Do No.”1” and “2” firstly, offload the
water draining soft tube;
2) Offload the water draining tank from the
chassis and take out the electrical
components.
Do No.”1” , “2” and “3” firstly;
Offload the connecting pipe;
Offload the tube clip at the rear;
Screw off the bolts at the right and left
side;
5) Lift up the evaporator, and draw it out
from the indoor unit;
123
Remark
AUX air conditioner service manual
2. Outdoor unit
No.
Part
1
General
operation
Operation Process
1) Screw off one fastening bolt from the
electrical box cover, and offload the
box cover;
2) Pull out the connecting cord from the
electrical box;
3) Screw off the five fastening bolts from
the cover board, and offload the cover
board;
Screw the six fastening bolts from the
front panel, and offload the front
panel;
4) Screw off the fastening bolts from the
electrical assembly panel;
5) Screw off the eight fastening bolts and
offload the outer frame;
2
Fan motor
1) Do No.”1” firstly;
2) Screw off the fastening nut(Rotate in
clockwise direction);
3) Offload the outdoor fan;
4) Screw off the four fastening bolts from
the electrical motor and offload the
electrical motor;
5) Screw off the two fastening bolts and
offload the bracket;
3
Condenser
1) Do “1”,”2” firstly;
2) Screw off the fastening bolts at the left
and right sides;
3) weld off the inlet and outlet tubes;
4) Offload the condenser;
124
Remark
AUX air conditioner service manual
No.
4
Part
Compressor
1)
2)
3)
4)
5)
Operation Process
Do “1” ,“2”, “3” firstly;
Open the cover of the compressor, and
loosen the connecting cables;
Weld off the inlet and outlet tubes of
the compressor;
Screw off three flat nuts;
Offload the compressor;
125
Remark
AUX air conditioner service manual
Chapter 5
Troubleshooting and electrical chart of AUX air conditioner
Section one
basic faults diagnose process of 9000BTU~12000BTU products
Troubleshooting Guide
1. The Foremost Inspecting Items
⑴The input voltage must be within +10% tolerance of the rated Voltage. If it is not the case, the
air-conditioner will probably not work normally.
⑵Check the connecting cord between indoor unit and outdoor unit to see if it is properly connected.
The connecting must be done according to the wiring diagram, please also notice that even different
models may have the connecting cord of the same specification.
Please check if the marks at the connecting terminal and the marks on the cord can match,
otherwise, the air-conditioner will not work normally.
⑶If the following phenomena are found, the problem is not from the air-conditioner itself.
NO. Problems
Causes
1
The motor is heard operating but the Since the air-conditioner is powered on, it will
air-conditioner dose not work when the come to working condition as long as you press
indoor unit is powered on
the ON/OFF button of the remote control and the
Signal is well received.
2
The compressor stops running but the If you turn off the air-conditioner and restart it
indoor fan motor keeps working when it immediately, it will return to normal in 3 minutes,
is at cooling mode with the indoor after that, the air-conditioner will automatically
temperature higher than set temperature. adjust the indoor fan speed to what you set.
3
The compressor works discontinuously The air-conditioner will automatically control the
at dehumidifying mode.
working of the compressor according to the inside
temperature
4
The air-conditioner does not work while The TIMER is set with the air-conditioner; it will
the LED display is on.
be in hold on condition. If the TIMER setting is
cancelled, the air-conditioner will return to
normal working condition
5
The compressor works discontinuously The compressor stops internally or the fan motor
at cooling and dehumidifying mode, and slows down to prevent the indoor heat exchanger
the indoor fan motor slows down.
from being frozen.
2. No Power Display
⑴Items
a) Check if the input voltage is correct?
b) Check if the AC power supply connecting is correct?
c) Check if the output voltage of the manostat L7805 (IC2) is correct?
⑵Trouble shooting procedure
126
AUX air conditioner service manual
3. The Indoor Fan Motor Does Not Work
⑴Items
a) Check if the indoor fan motor is connected correctly to the connector (CN8)?
b) Check if the AC input voltage is correct?
c) Check if the IC of indoor fan motor is connected correctly to the connector (CN2)?
d) Check if the capacity of indoor fan motor is connected correctly to the connector (CN8)?
⑵Trouble shooting procedure
127
AUX air conditioner service manual
4. The Outdoor Unit Does Not Work
⑴Items
a) Check if the input voltage is correct?
b) Check if the wire connection of the outdoor connecting terminal is correct?
⑵Trouble shooting procedure
128
AUX air conditioner service manual
5. The Step Motor Does Not Work
⑴Items
a) Check if the input voltage is correct?
b) Check if the step motor controlling the up-down movement firmly connected to Cn2?
⑵Trouble shooting procedure
6. Heating Mode Can Work, But No Hot Air Blow
⑴Check if the
set temperature is lower than the indoor temperature?
⑵Check if the indoor PCB is connected to the terminal correctly?
129
AUX air conditioner service manual
7. Remote Control Can Not Work
Trouble shooting procedure
8. The Failure Analysis of the Main Parts
130
AUX air conditioner service manual
131
AUX air conditioner service manual
Section two
basic faults diagnose process of 18000BTU~24000BTU products
Troubleshooting Guide
1. The Foremost Inspecting Items
⑴The input voltage must be within +10% tolerance of the rated Voltage. If it is not the case, the
air-conditioner will probably not work normally.
⑵ Check the connecting cord between indoor unit and outdoor unit to see if it is properly
connected. The connecting must be done according to the wiring diagram, please also notice that even
different models may have the connecting cord of the same specification.
Please check if the marks at the connecting terminal and the marks on the cord can match,
otherwise, the air-conditioner will not work normally.
⑶If the following phenomena are found, the problem is not from the air-conditioner itself.
NO.
1
2
3
4
5
Problems
Causes
The motor is heard operating but the Since the air-conditioner is powered on, it will
air-conditioner dose not work when the come to working condition as long as you press
indoor unit is powered on
the ON/OFF button of the remote control and the
signal is well received.
The compressor stops running but the If you turn off the air-conditioner and restart it
indoor fan motor keeps working when it immediately, it will return to normal in 3 minutes,
is at cooling mode with the indoor after that, the air-conditioner will automatically
temperature higher than set temperature. adjust the indoor fan speed to what you set.
The compressor works discontinuously The air-conditioner will automatically control the
at dehumidifying mode.
working of the compressor according to the inside
temperature
The air-conditioner does not work while The TIMER is set with the air-conditioner; it will
the LED display is on.
be in hold on condition. If the TIMER setting is
cancelled, the air-conditioner will return to normal
working condition.
The compressor works discontinuously The compressor stops internally or the fan motor
at cooling and dehumidifying mode, and slows down to prevent the indoor heat exchanger
the indoor fan motor slows down.
from being frozen.
2. No Power Display
⑴Items
①Check if the input voltage is correct?
②Check if the AC power supply connecting is correct?
③Check if the output voltage of the manostat L7805(IC2)is correct?
⑵Trouble shooting procedure
132
AUX air conditioner service manual
3. The Indoor Fan Motor Does Not Work
⑴Items
①Check if the indoor fan motor is connected correctly to the connector(CN8)?
②Check if the AC input voltage is correct?
③Check if the IC of indoor fan motor is connected correctly to the connector(CN2)?
④Check if the capacity of indoor fan motor is connected correctly to the connector(CN8)?
⑵Trouble shooting procedure
133
AUX air conditioner service manual
4. The Outdoor Unit Does Not Work
⑴Items
①Check if the input voltage is correct?
②Check if the wire connection of the outdoor connecting terminal is correct?
⑵Trouble shooting procedure
134
AUX air conditioner service manual
5. The Step Motor Does Not Work
⑴Items
①Check if the input voltage is correct?
②Check if the step motor controlling the up-down movement firmly connected to Cn2?
⑵Trouble shooting procedure
6. Heating Mode Can Work, But No Hot Air Blow
⑴Check if the set temperature is lower than the indoor temperature?
⑵Check if the indoor PCB is connected to the terminal correctly?
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AUX air conditioner service manual
7. Remote Control Can Not Work
Trouble shooting procedure
8. The Failure Analysis of the Main Parts
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AUX air conditioner service manual
Section three
Electric wiring diagram of AUX air conditioner
1.7000~12000BTU Electric wiring diagram：
⑴ Indoor unit：
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AUX air conditioner service manual
⑵ Outdoor unit：
Fan Motor
Black
Fa n Mo to r
Ca pac it or
Re d
Br ow n
O rientation
Valve
Wh it e
O ver curr ent
Pr otector
Co mpressor
Black
Black
Re d
Blu e
Re d
Blue
Yellow
G ree n
Ye llow
Co mpr e sso r
Ca pa cit o r
1
Red
2
Y /G
4
5
Yellow
Blac k G reen Blue
Br ow n
To In do o r Un it
Fan Motor
Black
R ed
Fa n Mo to r
C a pa cito r
B r ow n
W h ti e
O ver curr ent
Pr otec tor
Compr essor
Bla ck
Black
Re d
Re d
Yellow
G reen
Ye lo w
Co mpr e sso r
Ca pa cit o r
1
Red
2
Y /G
Black
Ye llow
G reen
To In do o r Un it
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2.18000BTU Electric wiring diagram
⑴ Indoor unit
Fro st
Elim inating Tran sform er
P lug
Receiver panel
S tep Mot or
Ind ication panel
Fan M ot or
Controlli ngPa nel
3
2
Y /G
L
N
5
4
T empe ratur e S e nsor
（R ） （B） （BL ）（BR）
Ye llo w
Gr ee n
Re d
Bla ck Blu e
Fo rce Swi tch
Br ow n
Hea t- Pu mp E Type
For series o f 180 00 Bt u/h
To P ower
To Ou tdoo r Unit
Tran sformer
Ind oor Un it E lect ric Ch art
R eceiver panel
S tep Mot or
Ind icat ion panel
Fan M oto r
C ontrolli ngPa ne l
2
Y /G
3
4
N
5
L
Tem per ature Sens or
（R） （B） （BL） （BR）
Ye llo w Re d
Gr ee n
Bla ck
To Ou tdoo r Uni t
F o rc e Swi tc h
C ol d W in d E Type
To P ower
139
For series o f 180 00 Bt u/h
Ind oor Un it Ele ct ric Cha rt
AUX air conditioner service manual
⑵ Outdoor unit：
Bla ck
Fan Motor
Cap acitor
W hi te
B rown
Or ie nta ti o n
Valv e
R ed
Bla ck
Com pre s sor
Over cur r ent
Pr otecto r
R ed
Blu e
Blu e
Co mpr e sso r
Ca pa cit o r
Ye llo w
Yellow
G reen
H eat -P ump Typ e
Fo rS er ies Of ( 70 00- 19 00 0 )B tu/h
（R） （B）
R ed
O utdoor U nitElectr ic Char t
Y/ G
（BL） （BR）
Yellow
G reen
Bla ck
Blue
Br ow n
To Ind oor U nit
To In do o r U nit
Fa n Mo to r
T emp er at u re
Sensor
θ
Fan Motor
Bla ck
Wh it e
Fa n mo to r Ca pa cit o r
Br ow n
Re d
Co mpr es so r
B lack
Ov erc u r re nt
Pr ot ec to r
B lack
R ed
Yello w
R ed
Ye llo w /Gr e en
Co mpr es so r
Ca pa cit o r
（R） （B）
Co ol W ind Type
For Ser ies of(7 000- 190 00 )Bt u/h
Re d
O utdoor U nitE le ctr ic Char t
Bla ck
Y/ G
Ye llo w /Gr e en
To I ndoor Uni t
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3.24000BTU Electric wiring diagram
⑴ Indoor unit：
Fr o st
E limin at in g Tr an s fo r mer
Plu g
Re ce ive r p an el
Ste p Mo t or
In d ica ti on pa n el
Fa n Mo o
t r
Cont ro llingPan el
3
2
Y /G
4
L
N
5
Te mpe ra tur e
To Ou td oo r Un it
Sen so r
（R） （B） （BL） （BR）
Y lo w
e
Gree n
R ed
B l ac k B l ue
Force Swit ch
B row n
Heat -Pum p E Type
Fo r s eri es of 24 00 0B tu/ h
To Power
T o Ou td oor Unit
T ran s o
f rmer
In d oo r Uni t E lec tr ic Ch ar t
Re ce ive r p an el
Ste p Mo t or
In d ica ti on pa n el
Fan Mo to r
Cont ro llingPan el
2
Y /G
3
4
N
5
L
Te mpe ra tu r e To Ou td oo r Un it
S en so r
（R） （B） （BL） （BR ）
Ye l lo w Red
Gree n
B l ac k
To Ou td oo r Un it
Force Switc h
C old Win d ET yp e
To Pow er
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Fo r se ri es o f 24 0 0 0Bt u/ h
Ind oo r Uni t E lec tr ic Ch ar t
AUX air conditioner service manual
⑵ Outdoor unit：（Single pole AC. Contractor wiring diagram）
Bla ck
Fa n Mo to r
Wh it e
Fa n mo to r
Ca pa cit o r
Bla ck
Red
Re d
Co mpressor
Co ntact
Ov er cu r re nt
Pr ot ec to r
Br ow n
Co mpr es so r
Br ow n
Ye llo w
Bla ck
Bla ck
Bla ck
Co mpr es so r
Ca pa cit o r
Y e l o w/Gr e e n
2
1
（B）Y /G
（R ）
C old Wind Type
Fo r se ri es o f 24 0 0 0Bt u/ h
R ed
Out door U ni t
El ectr ic C har t
Bla ck
Fan Motor
Re d
T o Indoo r
U nit
To In d oo r Uni t
Fa n Mo to r
Ca pa cit o r
Re d
Or ie nt at io n
Valv e
Wh it e
O ver curr ent
Pr otector
Bla ck
Br ow n
Blu e
Bla ck
1
Heat -Pum p Type
Fo r se ri es o f 24 0 0 0Bt u/ h
Blu e
Yell o w
G reen
Ye llo w
Co mpr es so r
Ca pa cit o r
Out door U ni t
El ect r ic C hart
Te mpe ra tu r e
Sen so r
Co mpressor
Co ntact
Br ow n
Co mpress or
Black
2
4
5
（R）（B ）Y /G（ BL）
（BR）
Re d Black
To Indoor
Un it
Yellow
G reen Blue
To In do o r U nit
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Br own To Indoor
U nit
AUX air conditioner service manual
⑶ Outdoor unit（Double pole AC. Contractor wiring diagram）
Bl ac k
Fan M oto r
Fa n mo to r
Ca pa ci to r
Re d
R ed
Wh ite
C om pressor
C ontact
Com presso r Br own
B ro wn
Ov er cu rr en t
Pro te cto r
Bl ac k
Black
Ye l lo w
Co m pr e s sor
Ca paci t o r
Ye l lo w/G re en
1 2
C ol d W in d Ty pe
（R）
（B）Y/ G
For series o f 240 00 Bt u/h
Red B lack
Ou tdo or U ni t
El ectr ic Char t
Fan M otor
Bl a c k
R ed
To I ndoor
U nit
Fan M otor
Capacito r
Red
Or i en tati o n
Val v e
White
C om pressor B ro wn
Bl ac k
T o Ind oor Un i t
C om press or
C ontact
Te mp er atu re
Sens or
Br own
Overc urr ent
Pro tec t or
B lue
Bl ac k
Yellow
Com press o r
Capa ci tor
Heat-Pump Type
For ser ies o f 240 00 Bt u/h
O ut door Uni t
El ectri c Char t
Bl ue
Yell ow
Green
1
2
4
5
（R）（B） Y/ G（B L）
（BR）
Red Bla ck
To I ndoor
U nit
Yell ow B lue
Green
To I ndoor Unit
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B rown To I ndoor
U nit
AUX air conditioner service manual
Chapter 6
Introduction of the regular service tools for air-conditioner
The regular service tool and application
1. Vacuum Pump
Vacuum pump is a device used in vacuumize for the mini type refrigerating equipment. The common
vacuum pump in practice is the revolving blade type. The exterior structure and the working theory are
indicated as the below pictures:
1： air intake
2： oil tank
6： electrical motor
3： air discharge
7： gas ballast valve
4：fan and coupling entry
8： oil filler plug
5： supporting base
9： oil mark
10： oil drain plug
Picture 6-1: The exterior structure of vacuum pump
1： air intake
7：spring
2： filter
8： rotor
3：oil filler plug
9：gas ballast valve
4：oil mark
10： Cylinder
5：oil drain plug
11：exhaust valve
Picture 6-2: Single-stage rotary Vacuum pump
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6： rotary blade
12： air vent
Picture
AUX air conditioner service manual
There is only one cylinder installed in the Single-stage rotary Vacuum pump. Inside the cylinder, the
rotor is eccentrically mounted inside the cylinder. There are two rotary blades fixed inside the rotor
groove, and two of them are oppressed tightly to the surface of the cylinder by the central spring force
and the centrifugal force produced in the process of rotation. The tangents created by the two rotary
blades to the rotor and cyclones divide the crescent space between the cylinder and rotor into three (or
two) parts. The space connects with the air intake is called air absorbing space; the spaced connects
with the air vent is called air exhausting space; the space between two rotary blades is called air
compressing space. When the rotor is rotated, the air absorbing space formed by the two tangents
between the right side rotary blade to the rotor and cylinder is continuously expanding, and the air
exists in the object system is sucked and filling in the space. When the left side rotary blade arrives at
the very position that can seal the orifice of the air absorbing channel, the air absorbing process is
ended and the volume of the absorbed air reach the maximum value. Along with the continuous
rotation of the rotor, the air exists between the two rotary blades is compressed, and its pressure is
consequently increased step by step. After the former right side rotary blade arrives at the orifice
connecting with the exhaust channel, and when the air pressure exists in the compression space is over
one standard atmosphere pressure value, the air will burst through the exhaust valve and vent. Two of
the rotary blades work together by turn. The rotor completes the air-absorbing and air-exhausting
process twice in every rotation circle. The exhaust valve is soaked in the oil in case of the atmosphere
enters into the pump.
The utmost pressure the single-stage vacuum pump can tolerate is 5Pa, and the utmost pressure the
double lever rotary vacuum pump can tolerate is 0.01Pa.
The attention proceeding during the application of the vacuum pump: The location site for the vacuum
pump shall be dry, ventilated and clean. The blow-off proof hose connects with the refrigerating
system and vacuum shall be short and without bend. Before starting the vacuum pump, check the
joints and the welding joints carefully to ensure there are no defects available, and confirm whether the
rubber plug to the air vent is off or not. Before turning off the vacuum pump, switch off the
Throughway valve firstly for separating the refrigerating system and the vacuum. When the vacuum
leaves unused, block the air intake and air vent by the rubber plug in case of the entry of the dust and
ordure to the pump body, which may affect the precision of the interior cavity. It’s necessary to
maintain the neatness of the vacuum pump, check the volume of the lubricating oil through the oil
window frequently, and enforce the daily maintenance applied to the vacuum pump for enhancing the
equipments’ perfectness ratio.
2. Pressure gauge
Due to the usual refrigerant leakage to the air-conditioner, the pressure gauge applied for the fullness
inspection to the refrigerant in the system is often in need. The pressure gauge is the usual inspection
tool for the refrigerant cooling system. It is in various specifications with the outer diameter from
60mm ～ 250mm. The applicable measurement range of the vacuum pressure gauge to the
air-conditioner refrigerating system is －0.1MPa～2.5Mpa, which is indicated in the Picture 2-33.
The pressure gauge usually matches with the three-way mend valve in application. The rotation
applied to the knob of the three-way mend valve in clockwise direction may reduce the size of the
valve bore. When the knob reaches the bottom of the rotation, the connection between the
corresponding tubing and the gas path of the outdoor unit will be cut off; The rotation applied to the
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knob of valve in counterclockwise direction may enlarge the size of the valve bore, and the
corresponding tubing will get through with the gas path of the outdoor unit. The refrigerating system
always gets through with the pressure gauge on the three-way mend valve without concerning the
position of the knob. The conjunction with the knob of the three-way mend valve may carry out the
process of vacuumizing, refrigerant filling and pressure testing etc. to the refrigerating system.
1： Connect with the vacuum pump or refrigerant tank
2： Connect with the mend position
Picture6-3
pressure gauge and three-way repair valve
3. Expander
When two copper tubes need to be jointed together, the one shall be inserted into the other tube’s
mouth. In this case, the inner diameter of the latter’s terminal position shall be expanded enough so as
to inosculate the entry parts of the former one. Only by this way the two tubes can be welded in
fastness and without easy leakage. The function of the expander is tube expanding for the various
types copper tubes according to the specific requirement. When expanding the tube, insert the
annealed copper tube into the corresponding aperture of the pipe wrench, and the protrusion length of
the copper pipes out from the pipe wrench is different because of the different pipe size. The copper
tube in bigger pipe size need longer expander and the copper tube in smaller pipe size need shorter
expander. For example, to the copper tube with size of Ф8, the length of the expander shall be around
10mm. Then, screw down the nuts located on the two terminals of pipe wrench so as to clamp the
copper tube, and insert copper tube into the expander head. Rotate the screw of the expander slowly in
the clockwise direction until the expansion length in need achieved. The practicality of the expander is
as indicated in the Picture 6-4, and the structure is as the picture 6-5.
4. Flaring tool
Flaring tool is specially applied in the copper tube’s flare expansion work so as to connect the indoor
and outdoor unit of the split air-conditioner by the tubing. When flare is expanded, fix the annealed
copper tube by the connecting nut, and insert the copper tube into the corresponding aperture of the
pipe wrench. The protrusion height of the copper tube out from the pipe wrench shall be 1/5 of the
tube‘s diameter. Then, screw down the nuts located on the two terminals of pipe wrench, and press the
cone-shaped head of the flare tool to the flare. Rotate the screw slowly in the clockwise direction until
the expected flare formed. The practicality of the flaring tool is as indicated in the Picture 6-5.
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Picture6-4
Expander
Picture6-5 Structure of expander
5. Tube-cutting knife
The tube-cutting knife is usually used for cutting the copper tubes in different lengths and diameters
when repairing or installing the air-conditioner. The types of the tube-cutting knife are various. The
common structure is as Picture 6-6 shows.
When cutting the copper tube, it shall be set at the place between the two rolling wheels of the
tube-cutting knife. Rotate the knife-supplying knob in the clockwise direction so as to clamp the
copper tube between the knife and the rolling wheel. Then rotate the knife-supplying knob and
simultaneously rotate the tube-cutting knife for cutting the copper tube. The force shall be balanced
and gently when rotating the knife-supplying knob, otherwise the copper tube may be distorted by
rough extrusion.
After the copper tube being cut, use the cutter knife to remove the burr attached
to the edge of the tube mouth in case of the copper scraps enter into the refrigerating system.
a：Bracket
Picture 6-6
b：Cutting wheel
c：Adjusting knob
the structure of the tube-cutting knife
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AUX air conditioner service manual
6. Tube bender
Tube bender is the tool used to change the configuration of the copper tube or process the copper tube
in a certain figure. The types of the tube bender are various and it is applicable in bending the copper
tube with the diameter less than 20mm. When bending the tube, insert the annealed copper tube into
the wheel groove of the tube bender, and lock the tube clamping hook tightly. Then rotate the handle
bar slowly until reaching the required angle. The structure of the tube bender is indicated in the Picture
6-7.
a：handle movement direction
d：tub-clamping hook
b： handle bar
e：tube-bending angle indicator
c：wheel
f: handle
Picture 6-7: structure of the tube bender picture
7. Gas welding apparatus
Since the copper tubes are largely applied in the refrigerating system of the air-conditioner, the gas
welding is in need for service use. The traditional gas welding apparatus uses the mixture gas of the
oxygen and acetylene, which can produce the high temperature blaze. The modern welding equipment
adopt the liquefied petroleum gas as the fuel and the oxygen boosting liquefied gas welding machine
as the apparatus for the tube-joint welding work of the refrigerating system. The gas welding
equipment mainly consists of the gas tank, the soft connecting pipe and the welding gun.
8. Digital clamp meter
Digital clamp meter is one of the widely applicable measurement apparatus in practice. It is the most
common tool in the inspection process to the electric malfunction of the refrigerating equipment. It can
measure the voltage of the AC or DC, the alternating current and resistance etc. Its practicality is as
indicated in the Picture 6-8.
⑴Measure the AC and DC voltage
Firstly, turn the on-off switch to category of the ACV (AC voltage) or DCV (DC voltage), and select a
measurement range which is bigger than the voltage to be measured. Then insert the red and black
meter pens into the jacks of the object electric-supplying socket. The consequent figure shows on the
reading panel is the value of the measured voltage. There is no fixed polarity to the AC voltage, so the
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AUX air conditioner service manual
meter pen of the clamp meter can be freely used without consideration of the selection between
positive and negative pole. When measuring the direct current voltage, turn the on-off switch to the
category of the DCV (DC voltage) , pay attention to select a measurement range larger than the
voltage to be measured, and confirm the polarity of the voltage to be measured. During the
measurement process, connect the red pen to the positive pole and the black pen to the negative pole of
the voltage. Otherwise, the clamp meter may be damaged by wrong connection.
⑵Measure the alternating current value
Rotate the on-off switch to the proper measurement range of the alternating current (ACA) firstly.
During measurement process, put the electric cable to be measured into the clamp type mouth of the
clamp meter, and the reading panel of the meter will show the electric current value of the cable basing
on the electromagnetic induction theory.
⑶Measure the electric resistance
Turn the on-off switch to the proper measurement range. Before measuring, connect the two meter
pens directly with each other (short circuit), and the figure shows on the reading panel shall be 0Ω
and to be accompanied by the tweet sound. If the figure is not 0Ω, it means the clamp meter is
damaged already or short of electric power. For the object electric resistance to be measured, the figure
displays on the reading panel is its electric resistance value after connecting the meter pens to the two
ends of the object resistance item.
Pi
Picture 6-8: digital clamp meter
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AUX air conditioner service manual
Chapter 7
Failure Analysis and Inspection of Electrical Control System
Air conditioner can be controlled by both strong-current circuit control panel and weak-current
electronic circuit control panel, control philosophies of which are different, so fault analysis
procedures of the two types shall be described separately:
Electrical system is the device to control and protect refrigerating system and fan system. Apart from
faults on electrical circuit, faults also may be resulted by the malfunction of refrigerating system and
fan system but be reflected through electrical control system. Therefore, refrigerating system and fan
system must be taken into consideration to analyze faults of electrical control system.
1. Strong Current Control System
Strong current control system is powered by single phase 220V or 380V service voltage, and with
relative simply controls circuit, fault inspection of strong current control system is not very difficult.
(1)Compressor and fan fails to operate
When switched on, compressor and fan fail to operate, faults of electrical circuits may include:
① Power failure
② Receptacle wire breakage
③ Fuse burns out
④ Loose contact of socket or receptacle
⑤ Service voltage is too low to make the motor operate, and then heat protector trips and cuts
off electrical power;
⑥ Wire breakage in option switch
⑦ Wire Breakage in Electrical Control Circuit resulted by improper operation, poor quality or
faults of refrigerating system and fan system; for example, fuse burns out may be resulted by
faults of refrigerating system and fan system besides wire contact and short circuit.
(2)Fan runs but compressor fails to operate
① Improper position of temperature Control knob;
② Contact of overload protective system breaks because refrigerating overloads during
operation and cause trip of protective system, or protective system can’t work properly
itself ;
③ Failure of compressor operation capacity resulted from improper maintenance or moisture.
④ Compressor motor burns out.
(3) Compressor starts and stops too frequently after air conditioner switches on
① Temperature sensor of temperature control system is installed too close to evaporator so that it
is impacted by evaporation temperature;
② Service voltage is instable because of instable electrical power network;
③ Poor contact of bimetal of overload protective system
(4)Long term continuous operation of compressor
① Because of too many heating appliances in the room, heat load of air conditioner is excessive
heavy;
② Contacts of temperature control system adhere to each other and cannot be broken off.
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AUX air conditioner service manual
(5)Heat pump air conditioner fails to heat
If air conditioner can produce cooling air but fail to produce heating air, there must be some faults in
magnetic reversing valve or switch.
① Magnetic loop of magnetic valve has burnt out or broken out because of:
a、 Operate in severe environment;
b、Magnetic loop stops and starts up frequently;
c、 Operate under excessive voltage for a long time so that loops run under high temperature rise
and insulation layer has been damaged.
② Spool in magnetic valve has jammed or damaged because of:
a、 Foreign substance has entered valve and jammed spool;
b、Spool has been damaged because of poor quality.
③ Reverse valve fails to work because of different reasons, but in most cases, impacted by
unclean refrigerant and poor manufacture or assembly quality.
④ Cool-heat switch fails to operate because of damaged structure and oxidized contact surface
⑤ Electric Leakage
Electric leakage on the surface resulted from declined insulation property, being affected by damping,
poor ground wire or even no ground wire connected.
2. Fault Analysis for Electronic Circuit Control System
Control panel of electronic circuit control system is a circuit with 5V or 12V low voltage, which is a
kind of small, safe, reliable and attractive panel with more control functions comparing to the
Electrical Circuit Control System.
(1)Air conditioner fails to work after switched on
When function button pushed on, air conditioner fails to work, and creates no sound, under this
circumstance, electrical power is not connected and all appliances connected with electrical power
shall be checked as per following sequence:
① Check whether there’s current in electrical power wire. Devices controlling the electrical
power wire shall be checked, for example, whether knife switch or air switch is broken.
② Check whether there’s any phase lack. For example, for three-phase air conditioner, one or
two phases of three- phase power network may break off, or phase of electrical power wire
may break off.
③ Check whether fuse of control panel of indoor unit breaks off or piezo-resistor has been
damaged. Protector shall be installed to cut off service power before excessively high voltage
or large current enters the control circuit.
④ Check if socket connector between control panel wire of indoor unit and power wire contacts
well. Socket connector may be self-locked, but also it may be loose contacted.
⑤ Check if key switch fails to work, for example, whether buttons contact well or whether
components of buttons have been broken.
⑥ Check whether indoor electronic control panel has been broken. Circuit or electronic
components of control panel may be damaged.
(2)Indoor fan runs, while compressor fails to work and trouble light blinks.
Blinking trouble light shows that system has some problems, including faults in electrical appliance or
system.
① Phase lack of service power wire or over low voltage: check if voltage of power wire is 10%
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AUX air conditioner service manual
②
③
④
⑤
⑥
⑦
⑧
lower than rated value;
Over-current on compressor: check if heat protector on the compressor pump shell has broken
off. Normally, heat protector will break off if current is excessively large. Heat protector of
three phase motor is embedded in motor winding in pump shell. Check junction box on the
pump shell by using universal meter, both for single phase and three phase motor; if winding
is current off, protector has cut off the power. Wait for 5 minutes, protector will restore to
original position.
Fan overheats or heat protector has damaged (refer to fan of outdoor unit). When fan runs
under excess load, its winding temperature will rise, and heat protector will break off and
power will be cut off. Check if inlet wire connector of fan is current on. If not, it shows that
heat protector works, and it will restore to original position after cooling down. If protector
fails to restore, it has been damaged and need to be replaced.
Poor contact of connector. Fan motor is also jointed with socket connector, connector lugs
may not contact well. In addition, check if wire in junction box of compressor pump shell is
loose or does not contact well;
AC contactor loops break off. If loops break off, contact points can not be closed, so that
power can not enter the motor;
Electronic circuit control panel has been broken;
High pressure switch has broken. If high voltage switch has been broken, connection lugs
cannot contact well. Check connection lugs with universal meter.
Trip of low pressure switch. When refrigerating system runs normally, connection lugs of low
voltage switch contact well. When refrigerating system has trouble or refrigerant leaks,
pressure in the system will decrease below trip point; low pressure switch will trip and cut off
service power.
(3)Air conditioner shuts down short after it starts up
① Excess high discharge pressure, which causes high pressure switch tripping;
② Excess low suction pressure causing trip of low pressure switch;
③ Fan motor has burnt out;
④ Heat protector trips.
(4)When air conditioner starts up, power indicator lights, indoor fan runs but compressor fails to
operate
It shows that there’s no problem in refrigerating system and fan system, but people operate the air
conditioner in wrong way or thermostat switch has broken, therefore, trouble light doesn’t blink.
① Wrong buttons have been pushed Air conditioner may be in ventilation situation instead of
refrigerating situation.
② Temperature has not reached set value. When set temperature of thermostat switch is higher
than room temperature, connection lugs of temperature controller opens all along,
refrigerating system cannot run. Proper temperature shall be set.
③ Sensor (thermal resistor) of temperature controller has broken, which cause improper
temperature control. Check resistance and temperature to decide whether it has broken
according to corresponding value of resistance/temperature.
3. Troubleshooting for compressor motor
There’re two types of motors for totally enclosed compressor of air conditioner: single- phase and
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AUX air conditioner service manual
three- phase. Single phase motor has two windings, i.e. startup winding and running winding. There’re
3 binding posts, in shell junction box of compressor. They are marked by A, B and C individually,
representing running post, startup post and common post. R and S are series connection points of two
windings, resistance value is sum of startup and running winding resistances; between C and S is
connection point of startup winding; between C and R is connection point of running winding.
Common faults of single phase motor are winding short circuit, disconnection and shell connecting.
Check the resistance of any two of three binding posts by using Rx1 of universal meter. Resistance of
windings of most compressor shall be as follows: RSR= RCS+ RCR，RCS≥RCR. Among which, RCR stands
for running winding resistance, RCS stands for startup winding resistance and RSR stands for total
resistance of windings.
Foregoing rule doesn’t work in all totally enclosed compressors, for some compressors, RCS≥RCR, for
some compressors, RCS= RCR. For some compressor, main winding and assistant winding can not be
judged according to normal rules because of different ways of wiring. Therefore, wire shall be
connected correctly as per connection diagram provided by manufacturer.
(1)Short circuit inspection for motor windings
Short circuits of windings refer to the fact that insulation performance of winding has been disrupted
which cause short circuit, including inter-turn short circuit, winding burnout, inter-winding and
inter-phase short circuit.
In some cases of short circuit, motor still runs, but runs slowly and current is excess large. Contrast
value of velocity /current depends on how many windings have short circuited. Remove outside wire
of motor, check resistance between C and S, and resistance between C and R, if resistance of terminal
of certain winding is lower than normal value, it shows that this winding has short circuited.
(2)Broken-circuit inspection of motor winding
Connection lugs in junction box are not welded or locked firmly and loose or break during operation.
In addition, insulation wires don’t insulate properly, and winding burns out. The motor can’t be run
because of broken-circuit.
Remove outside wire of motor, check conduct condition of two connection points with R×1 of
universal meter. If two connection terminals don’t conduct, i.e. resistance between them is infinite
large, undoubtedly, this winding has broken. Find out broken points and connect them again.
(3)Grounding inspection of motor windings
Motor windings being affected by moisture, insulation layer aging or being damaged and other
condition may cause short circuit of motor windings and shell. Under such circumstance, motor can
not start up and fuse will burn out or relay will trap. Check the winding with universal or megohm
meter, with one handle touching common terminal and the other handle touching motor shell. If
resistance is very low, windings touch the shell and cause short circuit. While checking, remove a scar
on the motor shell and touch the bare metal for measure.
There’re two connection forms for windings of three phase motor: star(Y )type and triangle (△) type.
Resistance values of three windings are same in both cases. Winding short circuit, breakout circuit and
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winding touching shell can also occur in three phase motor. Check the faults with universal meter.
For star- type connection motor, resistance can be measured individually; for triangle- type connection
motor, three windings shall be disconnected before resistance values are measured.
4. Inspection of switches and components of appliances
(1)Inspection of selection switch
Check corresponding contact points for different functions with universal meter, if, two connection
points conduct, resistance shall be zero; two connection points don’t conduct, resistance is infinitely
great, otherwise, selection switch has some problems.
(2)Inspection of temperature controller
① Expansion bag is broken, and temperature sensitivity gas leaks, so expansion bag doesn’t expand in
response to the change of ambient temperature, and therefore, fails to act with linked pole. Check
method: check the switch on and switch off points with universal meter, and turn the temperature
setting button at the same time. If controller fails to respond, it proves that expansion bag is broken
and temperature controller needs to be replaced with new one.
② Electronic contact points fail to contact well. If temperature changes regularly and in a large scale,
it will cause frequent startup and stop of compressor and also contact points contact and break time
and again , and contact point surface will be burned and create carbon layer which stops electrical
conduct. Contact points are in the position of switch on, but fail to connect with power. Check method:
clean contact points with absolute alcohol, and check the conduct condition of temperature controller
with universal meter when it is in the position of “switch on”.
③ Tension of offsetting spring is not enough. When pressure temperature sensitive gas in expansion
bag decreases and fails to push the linked pole back. Offsetting spring shall be replaced with a new
one.
④ There’re some burrs or other dirt on the surface of electrical contactors which cause contactors
failing to break off. Abrade the burrs with 0# sand paper and make the contactor surface smooth.
(3)Inspection of protection relay
In normal condition, contactors of protection relay are closed, and check with universal meter,
contactors shall be in conducting situation, or the relay shall be replaced.
(4)Check of running capacitor
Remove a handle of capacitor to be tested, check resistance of two ends of capacitor with universal
meter. In the normal condition, index finger of universal meter swings back rapidly and then rises to
infinitely great. If index finger doesn’t move and resistance remains infinitely great, capacitor has
broken off; if index finger swings to “0” and stop moving and resistance is zero, capacitor has
disrupted; if resistance remains at certain value, capacitor leaks.
(5)Check of transistor
① Check of diode capacity
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a、Commute, demodulation, switch and stabilivolt diode. Remove diode from electrical panel, check its
single phase conductivity with R×1K and R×100 of universal meter. Check method: contact two ends
of diode with two handles of meter, record the resistance value, then change two handles with each
other and measure again. For a normal diode, two resistance values are different greatly; large one is
called reverse resistance and the smaller one forward resistance. Normally, forward resistance of
silicon diode is several hundreds or thousands ohm, and reverse resistance can be 1 1MΩ; for
germanium diode, forward resistances is 0~1000Ω, while reverse resistance over 100KΩ. If reverse
resistance is very low, this diode has been broken; if both reverse and forward resistances are ∞, diode
has broken; If difference between reverse and forward resistances is very slight or any of the two
resistances deviates greatly from normal value, this diode is defective and shall be replaced. However,
the said standard doesn’t apply to some special diodes, for example, high-voltage silicon stack,
(forward resistance of which is also very large, index finger only moves slightly even in the R×10K of
universal meter), and some stabilivolt tubes (reverse resistance around 20KΩ).
b、Light-emitting diode(LED). Except low voltage types, forward conductive voltage is larger than
1.8V, while most universal meters are of a voltage of 1.5V(except for R×10K), so they are unable to
make diode conduct, which cause reverse and forward resistances very large or even infinitely great.
To check LED, R×10K or universal meters with 9V or over voltage shall be used. When we use
R×10K of universal meter, LED can be checked in the same way as normal diode. No matter what
kind of diode, positive and negative poles can be judged. When you measure reverse resistance, the
end touched by red handle is positive pole, the other end is negative pole.
② Performance check for common triode
Main parameters to be measured are Iceo and hFE. In general, actual-measured resistance of
germanium triode with middle-small power shall be over 10~20KΩ; resistance of silicon triode shall
be over 100KΩ, and actually-measured value is infinitely great, i.e. index finger doesn’t swing. If
actual resistance is excess slight, it shows that Iceo is very large, and this kind of triodes can not be
used for their poor capacity. If actual resistance nears zero, c and e poles triode has broken down.
ICBO can also be measured in the same way: touch two handles of universal meter on b and c poles to
measure reverse resistance between them. Normally, resistance of germanium triode is larger than that
we obtain when we measure Iceo, and resistance of silicon triode is infinite great.
Based on the situation of measuring Iceo, another 100KΩ resistance(silicon triode) or 20KΩ
resistance(germanium) shall be connected to b and c poles. The more value indicated by index finger
becomes small, and the more hFE is large; if resistance doesn’t change much or changes slightly, triode
is broken or its enlargement capacity is very poor. Also, you can touch b and c with wet hands, but
avoiding direct touch of b and c, to measure the resistance. In addition, most universal meters
produced in recent years have position to measure hFE of small power triode. Operation method: turn
resistance position to 0Ω, and then turn to hFE position; Insert handles to related test hole, and read the
enlargement coefficient from hFE rule directly.
5. Cases of Maintenance of Electrical Control System
Case 1 Silicon Control is broken and indoor unit creates noise
Product Model：ASW-H07B4/HA
Phenomena：When unit is switched off, indoor fan runs slowly, and when it is turned on, unpleasant
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noise can be heard.
Cause analysis: according to clients description and phenomena analysis, we presumed that indoor
motor couldn’t provide power properly; checked power voltage of indoor motor, it was 100V voltage
when motor was switched off; when switched off, motor still moved slowly, and produced heat and
caused its plastic support deformed, plastic-mould motor moved from its original position, and then
wind blades touched with basement and produce unpleasant noise, and smell like something burning
can be smelt in the room. We concluded that silicon control of fan has damaged.
Solution: replace main control panel.
Experience conclusion: fan running velocity of indoor split- mounted unit is controlled by silicon
control, when electrical voltage becomes very low or fluctuates within a large range, silicon control
can be disrupted in one phase, and indoor fan still has voltage when the unit has been turned off.
Because silicon is disrupted, motor produces non-sine wave power, which cause instable running of
motor and loud noise.
Case 2 Indoor fan still runs when unit has been turned off and starts to run before it is turned on
Product Model：ASW-H12A4/HS
Phenomena: indoor fan still runs when the unit has been turned off and starts to run before it is turned
on.
Analysis: according to the client, when the unit is electrified, the client turned on the power with
remote controller and then turned off, indoor fan still run. We presumed that indoor motor fails to
provide power properly. Checked the voltage of indoor fan, motor produced 158v voltage when unit
was electrified but the unit is turned off, so motor run when motor was electrified. We concluded that
fan control silicon is broken.
Solution: unit operated normally after controller was replaced with another of same model.
Experience Conclusion: Velocity of split mounted indoor fan is controlled by silicon, when power
voltage is relative low or fluctuate within a large range, controlled silicon can be disrupted, fan still has
voltage when the unit is turned off, and can not stop running.
Case 3 Receiver of remote controller can not function properly
Product Model: ASW-H12A4/H
Phenomena: remote controller can’t turn on the unit
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Reason Analysis: to check remote controller, point the remote controller to an ordinary radio and push
any buttons on it, radio responded, so remote controller worked well, and there must be some faults in
main control panel or receiver of remote controller of indoor unit. Opened outside cover of indoor unit
to check 220V input power and 12V and 5V voltage, and found that they functioned properly; started
up air conditioner manually and it operated well, so main control panel had no problem. We presumed
that fault must occur on the components of remote receiver. We checked the receiver and found that
insulation resistance of ceramic chip capacitor (103Z/50v) was only several thousand ohm, while
resistance of good ceramic chip capacitor shall be over 10000MΩ, leakage current was too large so
that receiver failed to function.
Solution: cut 103 capacitor or replaced display panel, air conditioner had been functioning normally
since then.
Experience conclusion: there’re many causes of malfunction of remote receiver, besides leakage of
capacitor, dry joint of components also can result in faults of remote receiver. In addition, environment
where air conditioner is used also can impact function of remote receiver; when environment humidity
is relatively high, condensate will condense on the weld joints on the back of remote display panel,
circuit panel is musty and its insulation performance declines, and welding joints leak, so remote
controller can’t turn on the air conditioner or fails to work. Clean circuit panel, dry the panel with
blower and then weld a layer of glass glue on the back of display panel, remote controller can function
properly. AM channel of radio can check whether remote control can send signal. If air conditioner
functions after turned on manually, main control panel has no problem, so there must be some faults in
receiver. When air conditioner need repair, especially repeated repair, it is very important to analyze
the reason why components can not function well instead of replacing components without careful
consideration.
Case 4 Temperature sensor cannot function well
Product Model：ASF-H24B4/FS
Phenomena: Poor heating efficiency, air velocity is relatively low.
Cause analysis: we went to client’s home to check the air conditioner, turned on the unit and pushed on
the heating button. Air velocity was relatively low, air outlet was very hot; under cooling and
ventilation mode, air velocity was adjustable and varies obviously, we concluded that fan functioned
well. So we presumed that there may be certain problem in indoor temperature sensor.
Solution: replaced indoor temperature sensor, and air condition functioned normally
Experience conclusion: when air conditioner heats the room, it can prevent producing of cold wind, so
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when indoor temperature sensor and heat exchanger exceed 25 Celsius degree, fan produces gentle
wind; when temperature exceeds 38 Celsius Degree, fan produces wind of set velocity. We checked
and found that wind velocity is very low, and wind temperature is quite high, so fan works well. So we
presumed that the sensor failed to reflect the correct temperature, and then indoor fan can’t run at set
velocity, so it must be replaced.
Problems in temperature sensor constitute a large percentage of all air conditioner faults. First of all,
we should know its function: detecting indoor temperature, when indoor temperature reaches set value,
it will control the function of indoor and outdoor units: under cooling situation, outdoor unit stops
running, while indoor unit continue to work; under heating situation, indoor unit will stop after surplus
heat has exhausted by fan.
3、Outdoor anti-frost temperature sensor: Detecting outdoor condenser coil
When outdoor loop temperature drops blow －6 Celsius Degree and maintains for 2 minutes, indoor
unit will be in the anti-frost situation; When resistance of outdoor coil sensor is relatively large, indoor
unit can’t work normally.
Case 5 Air conditioner can’t refrigerate the room (communication fault)
Product Model：ASW-H24B4/A
Phenomena: function light of indoor unit blinks (other lights extinguish), indoor and outdoor units fail
to work.
Reason Analysis: we turned on the air conditioner, and it worked well. After about 30 minutes, indoor
and outdoor units stopped to work, function light blinked, and we pushed buttons, air conditioner
didn’t respond; we pulled the socket from the power receptacle, and then tried to start up the air
condition once again; the unit worked for 30 minutes and then the same phenomena occurred again. So
we presumed that there’s no problem in unit, and probably outside communication interfered the
proper function of air conditioner. Fault code provided by our company also indicated outside
interference. We checked communication line between outdoor and indoor units and didn’t find any
problem, so we confirmed that our presumption was right.
Solution: parallel connect a 103 ceramic chip capacitor to signal line of computer panel, or replace
anti-interference C3Y computer panel.
Experience conclusion: pay attention to the indication panel, and find out cause of faults. If outdoor
temperature sensor has problem or indoor and outdoor signal line disconnect, time indicator of non
digital indication panel will blink 1 time/second, and E2 code will be displayed on the digital
indication panel, temperature light of three-phase A series will blink and other indication lights will
extinguish.
Case 6 outside Communication Interference
Product Model: ASW-H12A4/HSA
Phenomena: close down irregularly, and produce continuous buzz sound.
Cause analysis: we checked remote controller, emergence unit and all sensors and found that they
functioned well. The client bought two air conditioners of same model; one functioned well, but the
other failed. We suspected that there’s some interference source, and we found that there was a
electronic rectifying energy-saving lamp in the room where air condition at fault was installed. When
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the lamp was turned off, air conditioner functioned properly. When lamp was turned on, we checked
receiver and found 2V AC electricity on the input end; when we turned out the lamp, and didn’t
operate remote controller, there’s no voltage on receiver.
Solution: replace fluorescent lamp with product of other brand
Experience Conclusion: wave produced by electron rectifier fluorescent lamp may superpose on
infrared wave and cause failure of receiver. To fix such kind of failure, we shall asked client for details
and check surrounding electrical appliances of air condition. Interference resources of air conditioner
signal include electromagnetic interference due to poor quality of power circuit, frequency interference,
and infrared interference. To fix the failure, we shall put a transparent dark-color light-filtering plate in
front of remote receiver, or install a magnetic ring on receiver panel, or replace controller.
Case 7 Protection of Power Phase Sequence
Product Model：ASF-H41A5/A
Phenomena: timing indicator and running indicator blinked when we started up the air conditioner
Cause Analysis: according to fault code, we judged that outdoor unit was in protection situation and
forced compressor running. The air conditioner could function properly, and pressure switch and
power circuit were also in good condition; we presumed that problem was caused by sequence check
protection. We changed phase sequence and turned on the air conditioner, compressor suddenly run
reversely. All these proved that phase sequence detecting panel had some problems.
Solution: replace detecting panel of outdoor unit.
Experience Conclusion: service personnel shall have some knowledge of circuit operation philosophy,
and find out the problems according to fault code. We shall work under the principle of “from simple
to complicated way”, (for example, in this case, when we adjusted phase sequence, compressor run
reversely after we turned on the air conditioner again. So compressor wiring shall be changed, and
make compressor run properly. ) Our A series air conditioners adopt three-phase power, installation
personnel sometimes may fail to connect phase line and zero line correctly, in this case, compressor
also can’t be started up. We should pay attention to this when we fix the fault of air conditioner.
Case 8 FS and DS Control Panel Button Failure
Product Model：ASF-H18B4/DS
Phenomena: control panel buttons couldn’t function, but remote controller worked.
Cause Analysis: because remote controller can receive signal, main computer panel has no problem.
After check, we found that low frequent diode IN4007 was used on the display panel produced by
Changzhou Hongdu Co., but according to main program, this button shall be high frequent. Control
panel and main panel are not compatible, and main program can’t respond to the signal from buttons.
Incompatibility of control panel and main panel mainly happened in the air conditioners manufactured
by Changzhou Hongdu Electronic Product Co. Ltd before February 2004.
Solution: replace the said control panel with that produced by Changzhou Hongdu Electronic Product
Co. Ltd after February 2004 or products from other companies; we also can replace D1～D12 diode
on control panel with IN4148 high-frequent diode.
Experience Conclusion: besides failures in buttons of DS panel, temperature regulation button on
FS(Y) also may fail to work well. Spaces for buttons on display panel may be too narrow and buttons
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on plastic panel may deform, so buttons may fail to work. In this case, control panel shall be replaced
with same model product.
Case 9 Compressor low -pressure can’t be started up
Product Model：ASW-H12A4/HS
Phenomena：Compressor of outdoor unit can’t be started up
Cause Analysis: Indoor unit works well; voltage output and resistance of outdoor compressor are in
normal scope, so there’s some problem in compressor. Resistance of each winding of compressor is in
normal scope, the client’s voltage was 198 V, which was within the scope of design standard. So
startup performance of compressor (48D129) is not good enough.
Solution: replace capacitor for 35UF compressor and parallel connect a auxiliary starter to compressor
capacitor. There’s no need to replace compressor
Case 10 Compressor Capacitor and fan capacitor
Product Model：ASW-H12A4/A
Phenomena: when air condition was in cooling situation, once compressor started up, air switch
tripped.
Cause Analysis: when air conditioner was in cooling function, compressor tripped once air condition
started up. We checked indoor unit and found it was in good condition, so fault is in the outdoor unit.
Opened outdoor unit and checked power line, resistance between L and N was infinitely great, but
there were no short circuit on two lines. Checked outdoor components one by one, we found that
compressor capacitor was disrupted.
Solution: replace compressor capacitor
Experience conclusion: if compressor trips when air conditioner is turned on, we shall check L and N
are short circuited. We shall further check indoor and outdoor components, and find out whether
they’re short circuited.
Case 11 Outdoor fan capacitor fault
Product Model：ASF-H24B4/DS
Phenomena: the air conditioner stops to work frequently and can’t function properly
Cause Analysis: air conditioner has been used in a restaurant for over one year under 220V power.
According to the client, air conditioner failed to refrigerate sometimes. We checked and found that
pressure was 5kg; current was 1.5A, so we suspected condenser was too dirty. We cleaned condenser
and fault wasn’t eliminated. We checked outdoor unit and found that outdoor fan run too slow, and
compressor stopped to work when current rose. We checked winding of fan motor, and motor shell
was very hot. We checked winding resistance after motor cooled down, it had no problem. So we
presumed that fan capacitor was broken.
Solution: replaced fan and capacitor
Experience conclusion: because fan capacitor can’t function well, so fan is in the protection situation,
heat can’t be exhausted, and pressure unit stops to work. After 3 minutes, pressure unit will be started
up again. The process repeats again and again, so air condition starts and stops frequently. Based on
the faults we can conclude that causes of faults can be various, and problems can be caused by the
mutual interference of electrical control and system. Therefore, we should check and observe carefully
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when we’re repairing air conditioners and avoid replicated work.
Case 12 Transformer Failure
Product Model：ASF-H18A4/FS
Phenomena: air conditioner didn’t function after it was turned on
Cause Analysis: checked power supply, there’s 220V input power, so power supply circuit has no
problem. Checked power socket, resistance is infinite great, so fuse or transformer might burn out.
Opened and checked indoor panel, we found that fuse was in proper situation, but transformer broke
off.
Solution: replace transformer
Experience Conclusion: if air condition fails to respond when it is turned on, we should check power
circuit first of all to find out faults quickly and accurately.
Case 13 AC Contactor
Product Model：ASW-H24B4/A
Phenomena: failing to produce heat
Cause analysis: turned on air conditioner, and switched to heating function, outdoor fan didn’t run, and
four-way valve closed; we checked and found power supply of AC contactor was regular; pushed on
AC contactor forcibly, compressor functioned; when we checked and found loop of AC contactor
broke off.
Solution: replace AC contactor.
Experience Conclusion: air conditioner fails to produce heat, if power supply of indoor unit is regular,
outdoor fan and four-way valve function well, compressor still fails to work, we shall check whether
contactor pulls on, loop resistance value is normal, and then check if there’s any problem in
compressor. Main problems in AC contactor may include loop burning out, contacting points loosing,
contaminated and burning out and etc.
Case 14 Power supply circuit failure
Product Model：ASW-H12A4/H
Phenomena: cooling failure
Cause Analysis: we started up the air conditioner, indoor worked well, but outdoor unit couldn’t start
up normally and produced abnormal sound; its voltage decreased from 230v to 138v, so we presumed
that there’s problem in power supply circuit. We checked power receptacle and found that decoration
worker had used grounding line as zero line.
Solution: connect grounding line and zero line correctly
Experience Conclusion: connect N end to zero line, and don’t replace zero line with grounding line, or
air switch will trip. If new air conditioner has problems, we should check power circuit firstly;
sometimes, power line is too thin, and startup current of air conditioner is quit large and produces large
voltage drop which will cause difficulties in startup. Besides electrical power problem, air switch may
cause startup trip.
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Chapter 8
Troubleshooting guide for Refrigerating System
Refrigerating system faults are very common to air conditioners; faults are various but they still have
some rules and also many maintenance experiences for reference. Troubleshooting steps here for
refrigerating system are not a must, but can be followed to eliminate faults.
1. Main steps for refrigerating system troubleshooting
⑴Check work condition of indoor and outdoor units including display condition of indicator panel,
check whether indoor unit works and air velocity is normal, whether outdoor fan and compressor runs;
Based on foregoing steps, we can judge what is the cause of refrigerating fault, electrical system or the
refrigerating system.
⑵Check all data of air conditioner
①Water drainage condition: Normally drainage water from indoor unit shall be continuous, but
impacted by environment humidity and temperature, this condition only can be taken for reference.
②Indoor unit air inlet and outlet temperature difference: Normal temperature difference shall be
within 12-14 Celsius degree, but they will also be impacted by temperature and wind velocity.
③Measure pressure of system: Generally speaking, in cooling operation, low pressure shall be within
0.45Mpa-0.50Mpa, and in heating operation, high pressure shall be within 1.8Mpa-2.2Mp; but
pressure may be impacted by ambient temperature. If outdoor air inlet temperature rise, gas discharge
pressure will be higher and condense temperature will be higher; on the contrary the result would be
lower. When load on air conditioner increases, return gas pressure will be higher and evaporate
temperature will be higher (normal evaporate temperature shall fall within 5 to 7 Celsius Degree).
2. Refrigerating system faults type
⑴Refrigerating system is blocked, often in capillary and dry filter which are narrowest in the whole
system. Normally, there’re 3 causes for block: dirt, ice and weld blocks.
①Dirt block generally occurs on the inlet of capillary because dirt in copper tube (such as slug, rust
scrap and scale) blocks refrigerating system. Knock the capillary slightly and air conditioner may
restore normal condition temporarily; In addition, we can judge block position and features from
condensate and frost on the surface of components as well as time for velocity restoration when air
condition is turned off.
②Ice block normally occurs on the outlet of capillary, because there’s some water in the system,
which suddenly vaporizes, cools down, condenses and becomes little ice particle and block the outlet
of capillary. We can heat the capillary outlet with welding machine, if air conditioner works again or
functions better, or switch off the air conditioner and then turn on again, it can refrigerate again for a
while, we can conclude that the refrigerating system is blocked by ice. In general, ice block occurs on
the newly installed or newly repaired air conditioner.
③Weld block occurs on the welds of capillary with similar phenomena as dirt block, and also often
happen in newly installed air conditioners.
⑵Leakage of refrigerating system: media of heating and cooling in air conditioner is refrigerant, if
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there is some leak source, refrigerant will leak out and air conditioner can’t cooling proper or
absolutely stop refrigerating. Leakage sources locate mainly on welds of evaporator, condenser, and
capillary, return gas and discharge tube of compressor, flare mouth, copper nut, connection tubes and
etc. Check the air conditioner visually and then inspect joints of tubes carefully. Generally, there’s
grease spot on the leakage source.
⑶Four-way valve fault: Generally occur when air conditioner works in heating mode. If four-way
valve can’t close tightly or is blocked, air conditioner can’t have a good effect. We can check close
condition of four-way valve when it is switched on or switched off. To fix the problem, we can switch
on air conditioner repeatedly or slightly knock four-way valve and make it restore its original position.
⑷One-way valve fault: one-way valve can only work in cooling mode, but when air conditioner
operating in heating mode, refrigerant will flow through auxiliary capillary, and if one-way valve can’t
close tightly or auxiliary capillary is blocked, heat-producing will be impacted, so if air conditioner
can be operated in cooling mode but fails to produce heat properly, we shall check one-way valve
carefully, if it is not caused by fault on four-way valve.
Section one
Refrigerant Filling and Filling Volume Determination
Filling refrigerant is a common problem in maintenance of air conditioner. After air conditioner
running for a long time, welding or copper tube may leak little refrigerant out to ambience.
Refrigerant in split units also will slowly leak out and cause air conditioner failing to work properly.
There’re two problems in refrigerant filling: how to fill and how to decide filling volume so that
refrigerant can meet design standard of air conditioner.
Different air conditioner has different refrigerant filling volume. Too much or too less refrigerant in air
conditioner will cause poor efficiency, higher power consumptions, shorter life and so on.
Under following conditions refrigerant shall be refilled or added:
⑴When welds or copper tube leaks, refrigerant shall be discharged completely, After welded, fixed
and vacuum properly refilling the air conditioner.
⑵If air conditioner has been running for a long time, refrigerant is not sufficient, so it shall be refilled.
⑶If the connection tube in split air conditioner had been extended, the refrigerant should be added
according to per design standard.
⒈ Operation steps for refrigerant filling
Air conditioners of different types and capacities shall be filled with different volumes of refrigerant
in different way.
⑴Add refrigerant with low pressure valve
If only small cooling capacity is required, refrigerant can be filled with low pressure valve.
Refrigerant flowing in low pressure is relatively slow, but that is safer and easier to control, so most
household air conditioners are filled with refrigerant in this way.
①Connect Low pressure hose with maintenance hole of low pressure valve and connect intermediate
hose with small refrigerant bottle. If vacuum pumping is required, firstly we shall connect high
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pressure hose with vacuum pump and vacuum the system.
②Tighten thimble head; Discharge air in the hose with refrigerant steam in system or refrigerant in
the bottle. If small refrigerant bottle has been connected with hose and vacuum pumping has been
done, there’s no need to discharge air.
③Start up air conditioner, check low pressure value when it runs stably and judge the remaining
refrigerant in system. Open valve on the refrigerant bottle and then refrigerant enters into refrigerating
system. At the same time, we should observe and control low pressure; continue to fill the refrigerant
until pressure reaches standard evaporate pressure.
④Refrigerant from low pressure valve is in gaseous form. When gas pressure in bottle is no longer
larger than pressure in system, we shall heat the bottle with warm water so as to promote gaseous
pressure in bottle and push refrigerant continue to flow into system. Do not stand refrigerant bottle
upside down to avoid liquid slugging accident.
⑵Add refrigerant with high pressure valve
Connect high pressure valve to special hose (with thimble) to add refrigerant. Tighten thimble head,
discharge air in the hose, and then stand the refrigerant bottle upside down and open bottle valve,
liquid refrigerant will flow into high pressure side of air conditioner. When pressure in bottle is no
longer larger than that in system, refrigerant will stop to flow into system. Heat the bottle with warm
water to promote pressure in bottle, and then liquid refrigerant continues to flow into system. The
whole operation process is conducted when compressor is switched off.
High pressure filling method shall be used to fill relatively large air conditioner or air conditioner by
using liquid reservoir. To control refrigerant filling volume, usually a weighing appliance will be used.
If no weighing appliance is available, refrigerant volume shall be controlled based on experience. For
the equipment without reservoir or requiring accurate filling volume, we can connect filling appliance
with low pressure valve, add or release part of refrigerant by using the same steps as the said low
pressure valve filling method.
⑶Determination of refrigerant volume
At present, R22 refrigerant is commonly used in household air conditioner. According to the thermal
feature, under normal work condition of air conditioner, volume of refrigerant shall be calculated as
per following parameters:
① Low pressure: evaporate pressure shall close to pressure on return gas tube of compressor which is
0.5MPa(absolute pressure 0.6MPa), and the evaporate temperature is 5℃;
② Return gas temperature: temperature on the return gas tube of compressor shall be within 7℃~15
℃, condensate instead of frost can occur on the return gas tube;
③ Running current: Generally running current of compressor shall not exceed rated value on the
nameplate;
④ Indoor unit air inlet and outlet temperature difference: In cooling operation, temperature difference
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shall be no less than 10℃ and in heating operation, temperature difference shall be over 15℃;
⑤ High pressure: High pressure value of cooling operation shall be about 1.5~1.9MPa;
⑥ Weighing: When we fill the air conditioner with refrigerant, we shall weigh refrigerant with
electronic weighing appliance if available. It is one best way to add the refrigerant.
⑦ Temperature of high and low pressure valves: Normally, the low pressure valve has the lower
temperature and more condensate than the high pressure valve of split units.
To check high pressure value, the ambient temperature should add about 15℃, for example, ambient
temperature measured is 35℃, actual temperature of refrigerant in condenser shall be about 50℃, so
we can know high pressure is 16.6MPa(absolute pressure); to check low pressure, evaporating
temperature is assumed as 5 ℃ , superheat temperature shall be 5 ℃ ~7 ℃ , according to the
Temperature/Pressure Relation Table, low pressure is 0.59MPa(absolute pressure).
Refrigerant volume shall be determined by combining all foregoing data. However, to air conditioners
with different types and brands, foregoing data are different, especially for the air conditioners which
have been used for many years, differences are more noticeable, and detailed volume shall be
analyzed by integrating various factors. For example, evaporation pressure of an air conditioner is
lower than 0.5MPa, but running current of compressor has reached rated value. In order to use
compressor safely, evaporating pressure has to be set below 0.5MPa, though under this circumference,
refrigerating capacity of air conditioner has been lowered.
⑷ Adding of refrigerant
During installation of the air conditioner, connection tube often has to be extended because of
installation positions; all manufacturers have their own requirement of refrigerant adding for extension
tube, normally, following principle shall be complied with:
Experience Value of Refrigerant adding for Extension Tube
Refrigerating. Capacity(W)
Connection Tube Size (Dia.)
Adding volume /M（g）
2000~3000
φ6.35×0.6/φ9.52×0.6
15
3000~5000
φ6.35×0.6/φ12.7×0.6
20
5000~7000
φ9.52×0.6/φ16×1.0
30
7000~12000
φ12.7×0.6/φ19×1.0
35
We can also calculate the volume of long tube, and then calculate adding quantity of refrigerant
according to its density.
Section two
Cleaning and blowing of refrigerating system
1. Cleaning of refrigerating system
When air conditioner can’t operate properly, insulation of compressor motor may be disrupted, coils
has been short circuited or windings have been burned, a large amount of acid oxide can be produced
and refrigerant may be polluted. So, besides replacing of compressor, the whole refrigerating system
shall be cleaned.
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Pollution degree of refrigerating system can be classified as: slightly polluted and seriously polluted.
When system is slightly polluted, condensed oil in it has not been polluted completely, and if
refrigerant and lubricant is released from line of compressor, it is transparent and will become light
yellow(normally they should be in white) if tested with litmus paper. If system has been seriously
polluted, when line of compressor is opened, tar odor can be smelt immediately, and condensed oil
from line is black, and if litmus paper is put into the oil, it will become mahogany in 5 minutes.
Refrigerant in totally enclosed compressor for small air conditioner shall be R22 which can be cleaned
with R113 (C2F3CL3—trichloroethane) according to following procedure:
⑴ Release refrigerant in refrigerating system, check color and odor to determine the pollution degree
of refrigerating system;
⑵ Remove compressor, release a little refrigerant from technical tube to check its color and odor, and
inspect whether there’s any foreign substance.
⑶ Fill liquid tank with R113, and then start pump to clean the system. For the slightly polluted
system, pump only need to run around 1 hour, but serious polluted system should be washed for
3~4 hours. If washing need to last for a long time, cleaning agent is dirty and filter has been
blocked and smudged, and so shall be replaced.
⑷ Cleaning agent shall be recovered after the system has been cleaned, and can be reused after being
treated. Cleaning agent in liquid tank shall be recovered from liquid tube.
⑸ When cleaning has finished, refrigerating system shall be purged with nitrogen and dried.
In the foregoing sketch, parts in broken line pane shall be disconnected from line as the system is
being dried. Blinds shall be installed on the flange disk of liquid squeeze line and liquid suction line;
to dry the system quickly, blow heat wind outside the refrigerating line when system is being
evacuated by vacuum pump. Install the refrigerating system again, and replace compressor and filter
with new ones.
Following aspects shall be noticed during cleaning
⑴ To avoid cleaning agent leaking out, pressure resistant hose shall be used and connection
joints shall be packed tightly.
⑵ Replace capillary or expansion with by pass pipe or pressure resistant pipe and connect
evaporator and condenser directly;
⑶ Water in refrigerating system shall be drained completely;
⑷ If compressor has been burned, acid in system shall be purged with nitrogen.
⑸ Compressor, expansion valve (capillary) and filter shall be cleaned with gasoline first and then be
dried with nitrogen.
2. Blowing of refrigerating system
After refrigerating machine has been removed, inevitably, there’re some slag, rust, scale and water in
the system which will abrade running parts, for example, score and rough the cylinder or pistol surface,
or impress concave on the contact surface of some parts, for example, blades of compressor becomes
rough, and valve spool has been damaged. Sometimes dirt may block system on the expansion valve,
capillary and filter (dirt block). Dirt and water also reflects with refrigerant and condensate and create
corrosive substance. Currently, cleaning equipment is rarely used to clean refrigerating system. High
pressure nitrogen is often used to blow the polluted system.
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Generally, system shall be purged under a pressure of 0.6MPa which can be pressurized with
refrigerating compressor, nitrogen bottle or air compressor (compressed air can’t be used in Freon
system). System shall be blown in sections, with dirt outlet set on the lowest point of each section.
Each dirt outlet shall be plugged up with cork (tied with steel wire). When pressure reaches 0.6MPa,
stop pressuring, and draw out cork, and discharge the dirt in this system by using high-velocity air
flow.
Hang a piece of white cloth on the dirt outlet to check if system has been cleaned completely. If white
cloth is clean, dirt in the system has been evacuated with gas, blowing can be stopped; if there’s some
stain on the white cloth, blowing shall continue.
Section three
Troubleshooting for four-way valve and compressor
1. Troubleshooting method for four-way valve of heat pump air conditioner
⑴ Troubleshooting of four-way valve
① Air conditioner can make cooling air but can’t make any heating air
Check service power voltage of electromagnetic loop by using millimeter; when unit is turned off,
measure the resistance of loop which normally shall be around 1400Ω. Switch on the air conditioner
and try to hear sound of magnetic operation so as to judge if control valve works well; check high
pressure with pressure meter, if it is very low, so we can judge that slide of reverse valve can’t be
moved and can’t change the flow direction of refrigerant when the unit made in heating operation.
② Fail to function in both cooling and heating operations
There’re two possibilities: discharge capacity of compressor is not sufficient or four-way valve itself is
of poor quality. Firstly, judge the quality and discharge capacity of compressor: remove four-way
valve, connect refrigerating system and run it. If the system can cool the room in a relative high
efficiency, the compressor is of good quality, and so it’s the four-way valve that can’t work well and
cause leakage of four copper tubes, high and low pressure tubes are short circuited.
③ Air conditioner is set in cooling operation but functions in heating operation.
Four-way valve is blocked inside and can’t reverse the direction;
④ Cooling normally after it is started and run 2~3 times
According to the work principle of four-way valve, we can judge that valve core can’t seal tightly, and
air leaks in 4 directions under high pressure, so pressure is not large enough to seal capillary control
valve, and slid of reverse valve can’t function successfully in one time.
⑵ Steps to change four-way valve
If it is clear that four-way valve is broken, it shall be replaced with the new one of same size and type,
and in the following way:
①、Remove the old four-way valve from air conditioner
②、Install new four-way valve and remove electromagnetic loop. 4 copper tube nozzles shall be
positioned in their original directions and angles, reverse valve shall be positioned horizontally.
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③、Weld high pressure tube first, and then the middle one of three low pressure tubes, finally left and
right tubes;
④、Select proper welding machine, flame shall be adjusted and can weld the valve immediately. Pack
the valve body with wet towel to avoid burning rubber and nylon sealing elements in it and causing
the leakage of four-way valve.
⑤、；Weld the tube one by one and start welding the second one after the first one cools down.
Welding shall be performed quickly and finished before temperature of four-way valve rises;
⑥、After four nozzles have been welded, clean the welds with wet tower, at the same time, lower the
temperature of four-way valve. Check the weld quality and adjust the angles of four tubes.
2. Troubleshooting for the compressor
⑴ Replace of compressor
If totally enclosed compressor has some fault, because its components can’t be bought easily, so even
motor is broken and renew the loop, the quality of compressor still can’t be ensured. Therefore,
compressor shall be replaced. During replacement of compressor, following 6 aspects shall be
complied with:
① New compressor shall be of the same type and specification as the old one. If unavailable, main
performances and characteristics of the new compressor, including nominal cooling capacity (same
work condition), power and capacity (voltage, phase number & frequency and current) of motor and
capacity of capacitor shall be same and similar as the old one,;
② Efficiency of new compressor shall be not lower than the old one;
③ Power voltage shall be based on the demand of client;
④ Refrigerant shall not be changed;
⑤ Outside dimension shall be same or similar to old one so that it can be installed on original
position.
⑥ Basement dimension shall be the same. If unavailable, basement shall be adjusted based on the old
dimension. Direction and position of discharge tube and return gas tubes shall be same or similar as
the old one. If unavailable, tube dimension shall be changed.
⑵Troubleshooting for totally enclosed compressor
① Poor refrigerating efficiency
Actual discharge capacity of compressor lowers and can’t reach the nominal capacity of product and
meet the original cool load. There are four factors for the poor refrigerating efficiency:
a) Severe abrasion of pistol and cylinder (including rotating type): Requirement of clearance between
pistol and cylinder is very strict, grease film inside is for lubrication and sealing. If clearance is too
wide, grease film will be broken and cause gas leakage; if clearance is too narrow, grease film may be
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burned or components can’t start up. So clearance scope between pistol and cylinder is very small. For
Diaφ50mm cylinder without pistol ring, fit clearance shall be within 0.011~0.018mm. If pistol or
cylinder wears out severely, when pistol compresses and exhaust the gas, a part of gas in cylinder will
leak into pump shell through clearance, so compressor can reach its original discharge capacity;
b) Gasket rib of cylinder cover is cracked (reciprocating): There’s a rib on the middle of gasket and it
separates and seals discharge cavity and return gas cavity, preventing high pressure (discharge) gas
from flowing to gas return cavity, and causing a part of gas being short-circuited. If a part of rib is
broken, some gas will be short-circuited, and exhausting quantity of compressor will lessen. To avoid
this type of fault, apply anti-florin rubber on two sides of steel rib. If asbestos rubber gasket is used,
risk of fault like this will be very high.
c) Severe leakage of gas valve(including rotary type): If discharge and return gas valve blades can’t
match tightly with valve line on the valve plate and there’s certain seam; when valve discharges or
returns gas, some gas will leak out from seam, and discharge capacity of compressor will lessen.
Follows are Main factors for this kind of faults: 1) system is not clean enough, there’s some dirt
flowing with refrigerant. Dirt sticks to the valve line and valve blades, when valve blades run,
abrasion of valve blades and valve line will speed up, and sealing performance will lessen gradually; 2)
discharge temperature is excess high often and so refrigerant produces particles, which sticks to valve
structure and damages tightness of valve; 3)slightly liquid hammering often happens in the system,
due to the impact of liquid, valve blades are deformed or damaged, or abraded severely, so tightness of
valve structure is decreased; valve plate has been liquid hammered severely, gas valve is damaged and
valve blades are broken, so that tightness of valve is severely damaged.
d) Crack of exhaust tube in pump shell(reciprocating). To the compressor with unbalanced
reciprocating, pump body librates sharply, exhaust tube will be cracked or broken and refrigerant
steam will circulate in pump shell; steam can’t be exhausted outside pump shell, so refrigerating
capacity of the system is almost zero.
The same symptoms of the foregoing four faults are: discharge pressure drops, return gas pressure
rises, and pressure difference between return gas and discharge pressure becomes relatively low or
very low, or becomes almost zero in the serious condition. In the normal condition, pressure difference
shall be very large, pump shell shall be hot in various degrees, and some discharge tube will be very
hot.
② Compressor can’t run normally
When compressor is switched on, motor will produce buzz in pump but fails to run. After 3~5 seconds,
heat protector trips and cut off the power supply. This symptom is resulted by following faults:
a) Main journal and bearing or big end and crankpin burn out and melt because of lack of
oil(commonly called coherence) , for oil in compressor is not enough or oil nozzle is blocked by
pistol;
b) Air valve is broken and broken valve blades fall into cylinder and block the pistol, so valve can’t
reciprocate;
c) Connection rod is broken and motor can’t be driven.
③ Motor in compressor is broken.
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Symptom is: when air conditioner is switched on, fuse protector breaks or air protector trips
immediately. There’re three reasons for this symptom:
a) Because motor stator windings have burn out, and insulation layer of electromagnetic loop has been
broken and windings touch the motor shell and are short circuited. These faults are caused by long
term overload running of air conditioner, at the same time, protector is broken, so windings run on the
over heat condition for a long time, insulation layer has been damaged;
b) Coils are short circuited which cause disruption of insulation layer of part of coils around the stator
winging, and some coils touch the shell. All the faults are caused by slight damage of some coils, scar
of which expands and disrupts insulation layer;
c) Short circuit: Insulation layer of power wire of motor is damaged or cut off and short circuited.
d) Insulation layer of stator windings has aged severely but hasn’t burned out. It symptom is different
from the former one: it can run 1~2 minutes, then fuse protector is burned or air protector trips. With
same reason, this kind of motor can’t work like motor with burnt windings.
④ Abnormal noise can be heard when air condition is running
When air conditioner runs, steady, low and rhythmic noise is inevitable. If it creates unpleasant noise,
it is abnormal. If it is not handled in time, components will be damaged, so we must pay attention to it.
Components loose and clash with each other, and create noise, generally, exhaust tube will clash with
pump shell, pistol clashes with valve plate and stator abrades with rotator. In addition, magnetic noise
may be created by motor.
Section 4
Cases of Refrigerating System Troubleshooting
Case 1: Capillary of outdoor unit is blocked by ice
Unit Model：ASW-12A4/H
Phenomena：Cooling fault
Cause Analysis: we went to client’s home to fix the air conditioner. It can cool when it was turned on,
after about 25 minutes, pressure and current of air conditioner decreased. According to the client,
compressor was replaced before, so compressor functioned well. Because cooling was normal in the
first 25 minutes, so we presumed that system was blocked by dirt or ice. Open top cover plate of
outdoor, we found that capillary outlet was frosted. Heat the frost with lighter, pressure and current
returned to the normal value, so we judged that system was blocked by ice. According to the client, it
was raining when the compressor was replaced, and water entered the system.
Solution: recover refrigerant to outdoor unit and install desiccation filter on the low pressure tube; run
the air conditioner until ice is removed completely. Remove desiccation filter and start the air
conditioner again, it can cool normally.
Experience Conclusion: water shall be prevented from flowing into system when maintenance
personnel are fixing the air conditioner, or it is likely that system will be blocked by ice. If capillary
inlet is frosted, the system has been blocked by dirt, if capillary outlet is frosted, blocked by ice.
Case 2: Capillary of outdoor unit was blocked by dirt
Unit Model：ASF-H24B4/FS
Phenomena：Poor cooling efficiency
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Cause Analysis: turned on the air conditioner, it could run normally. Checked filter of indoor unit and
heat exchangers, and found that they were quite clean and wouldn’t impact the cooling efficiency.
Checked capacitors and all parameters of indoor and outdoor fans, voltage was 220v, current was
13.5A, low pressure was 0.4MPa and there’s no extension line, outdoor compressor also run normally,
in addition, no flow restriction was found. After air conditioner run about 20 minutes, measured
current and pressure: current became 15A, system pressure became 0.3MPa, refrigerating efficiency
became worse. According to the data, we presumed that system was blocked or flow was restricted
somewhere. We checked the connection line between indoor and outdoor units and didn’t find flow
restriction. So we checked outdoor unit, and found two groups of capillaries connecting distributor
were frosted, so we believed that there’s some problem on the capillary. Separated the distributor and
capillaries and found that filter net in the distributor was blocked by oil sludge and foreign substance,
but hadn’t been blocked up, so flow in the capillary should be sufficient and caused flow restriction
and frost.
Solution: replace new distributor, purge the system with nitrogen, vaccumize the system, and then fill
refrigerant in the system; air conditioner functions well since then.
Experience Conclusion: to air conditioner with relatively poor cooling performance, we should
consider all conditions comprehensively and have clear philosophy: check from main to secondary,
from inside to outside and from outer to inner; following aspects shall be considered:
1. Check whether air conditioner works well;
2. Check heat exchange condition of outdoor and indoor units, consider the interference of
surrounding appliances;
3. Outdoor and indoor fan velocity will impact heat exchange;
4. Measure all parameters and judge if they’re normal, and analyze reasons;
5. Consider impact of extended tube on the performance of air conditioner;
6. Consider interruption of running of indoor and outdoor compressor;
7. Check if there’s no throttle in the system, and consider impact of cold flow on cooling performance.
Case 3: Capillary of separator of indoor unit evaporator is blocked
Unit Model： ASF-41A5/A
Phenomena: Poor cooling efficiency
Cause Analysis: this air conditioner was brand new, indoor and outdoor units were very clean and
ventilate normally; service power functioned well, indoor unit air outlet well; but we found that
temperature difference of air inlet and outlet of indoor unit was relatively low; checked connection
pipe of outdoor and found that low pressure tube was frosted, so we presumed that refrigerant in the
system was excessive, so we released some Freon and refrigerating efficiency became worse; so we
judged that there’s flow restriction in the system; opened the panel of indoor unit, touched evaporator,
and found that temperature difference of upper and down part of evaporator was obviously large.
Touched capillary of evaporator of indoor unit, found that two groups of capillaries were slightly
frosted. So faults were caused by block in capillaries.
Solution: removed capillaries with welding machine, found that capillary outlet was blocked by weld
liquid. Replaced capillaries and air conditioner functioned well since then.
Experience Conclusion: according to phenomena, we presumed there’s excessive refrigerant; when we
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analyze this phenomenon, we shall check whether air flow of indoor unit is sufficient. If it is in normal
condition, check whether there’s secondary flow restriction; judge the fault by analyze phenomena
carefully.
Case 4: Filter of outdoor unit was blocked by dirt
Unit Model：ASW-H18A4
Phenomena: air conditioner can’t cool and start & stop frequently
Cause Analysis: air conditioner failed to cool, outdoor unit started and stopped frequently, indoor unit
could be started by remote controller and run normally, but outdoor unit started and stopped every
three minutes, and air was not cool in the three minutes, so we presumed that refrigerating system
couldn’t work well; check low pressure with pressure meter: balanced pressure was 1.1MPa when air
conditioner was turned off, and pressure dropped to 0.1MPa when air conditioner was turned off and
returned to balanced pressure when it was turned off again. When outdoor unit run, frost could be
found from filter to capillary to high pressure tube, so the air conditioner was blocked by dirt.
Solution: replaced filter
Experience Conclusion: If outdoor unit starts up frequently, we should find out it is resulted by faults
in circuit or in cooling system. Generally, following symptoms will occur if filter is blocked: capillary
outlet and sometimes evaporator are frosted; low pressure is lower than normal, high pressure is
slightly lower than normal value; when air conditioner is turned out, balanced pressure closes to the
saturated pressure in ambient temperature; compressor discharge temperature and shell temperature
rise. If current is higher than normal value and air conditioner starts and stops frequently, fault may
not be in the compressor. We should consider symptoms comprehensively. Generally, when we fix an
air conditioner, we should check current and maintenance pressure, if current is relative large and
pressure is a relative low, system is blocked, and so we should check filter and capillary firstly.
Case 5 Leakage of connection line of evaporator
Unit Model：ASW-H09A4/H
Phenomena: couldn’t cool
Cause Analysis: according to the client, air conditioner can’t cool. We checked indoor and outdoor
units, both run properly, so circuit is in good condition; we checked running pressure of outdoor unit
was minus and there’s no refrigerant leaking from line joints, there’s no leakage on indoor evaporator
and outdoor unit; we disassembled the indoor unit and found that there’s a crack on the protection
spring of evaporator junction.
Solution: welded the line again, vacuums the system and added refrigerant, and air conditioner
functions proper since then.
Experience Conclusion: It is very difficult to find out leakage sources, we shall pay particular
attention to connection tube of evaporator.
Case 6 flare mouth of connection tube is broken
Unit Model：ASW-H09A4/HY
Phenomena：Poor cooling and heating efficiency
Cause Analysis: turned on the air conditioner and pushed on cooling mode, indoor unit produced wind
properly, two units were very clean, but temperature different of air inlet and outlet is very low; air
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conditioner run 5 minutes, and evaporator of indoor unit was frosted, so we presumed that refrigerant
was not sufficient; we checked and found that low pressure was 3KG. Turned off air conditioner,
checked indoor & outdoor units and connection tube and found oil stain on the junction of low
pressure copper tube.
Solution: released refrigerant, twisted off line junction and found a small crack; repaired flare mouth,
checked leakage sources under high pressure, vacuum the system, added refrigerant, and then test run
the air conditioner and it worked properly.
Experience Conclusion: to fix the air conditioner, maintenance personnel shall have flexible thoughts
and broad vision; find out actual problems according to principle of air conditioner.
Case 7: Nut of connection tube is broken.
Unit Model：ASW-H12A4/HSA
Phenomena: Poor cooling efficiency and indoor unit was frozen
Cause Analysis: checked and found that low pressure of outdoor unit was very low, return gas tube
was frosted, but the tube was not bent. Turned on ventilation mode, we found that low pressure was
lower than normal value when ice was melted. We checked leakage sources and found that nut of
connection tube on indoor unit was broken.
Solution: replace nut, vacuum the system and add refrigerant.
Experience Conclusion: analyze the actual condition carefully, generally, analyze fault according to
the frosted position and area. Refrigerant lack will cause frost on liquid tube; upper part of evaporator
will be frozen.
Case 8 Welds of high pressure valve leaked
Unit Model： ASW-H12A4
Phenomena: Poor cooling efficiency and indoor unit leaked water
Cause Analysis: checked air conditioner and found that air conditioner failed to work well and the
cooling efficiency is poor. Evaporator of indoor unit was frosted, so we presumed that system was
lack of refrigerant; we found system pressure was very low. We checked the system and found leakage
source on the connection tube of High pressure valve body. Welded the leakage source and added
refrigerant; turned on air conditioner and it worked well.
Experience Conclusion: air conditioner lacks in refrigerant and is frosted, so indoor unit leaks and the
cooling efficiency is poor. The fundamental problems are weld leakage and lacking in refrigerant
Case 9 Weld leakage of condenser distributor
Unit Model：ASF-41A5
Phenomena: Failed to cool, running indicator and 18# indicator blinked at the same time, air
conditioner couldn’t be turned on.
Cause Analysis: air conditioner was only used for two days, according to client, air conditioner failed
to cool. We checked the air conditioner, voltage was 390v, balanced pressure was 0MPa; according to
phenomena and data, we presumed that the system lacked of refrigerant, the air conditioner was in low
pressure protection situation. Opened outdoor unit, we found oil stain on the weld of distributor of
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condenser, so refrigerant leaked out.
Solution: repair-welded leak source and added refrigerant
Experience Conclusion: when air conditioner is running, system pressure is zero, we can judge that
refrigerant leaks out; generally, oil stain can be seen on leak sources. Maintenance personnel shall be
familiar with blinking conditions of indicator.
Case 10 Weld of U type tube of condenser leaked
Unit Model：ASW-H12B4/HY
Phenomena: failed to cool
Cause Analysis: air conditioner was used less than one month, cooling efficiency was unsatisfactory.
Checked the air conditioner, temperature of compressor was relatively high; current was 3A, low
pressure was 3kg, outdoor fan run normally. We presumed that system was blocked, leaked or return
gas and discharge capacity of compressor was quite unsatisfactory. We brought air conditioner to
Maintenance Office, purged the system with nitrogen, checked leak sources under high pressure and
found that weld of U type tube under condenser leaked.
Solution: repair-welded, vacuum the system and filled the system with refrigerant.
Experience Conclusion: air conditioner has been used for a short time, but refrigerating efficiency is
unsatisfactory, in most cases, system leaks, so firstly we shall check leak source.
Case 11 Four-way valve was broken
Unit Model：ASF-H24B4
Phenomena：Air conditioner produced heat once it was started up.
Cause Analysis: once we turned on the air conditioner, it worked in heating mode. It was a new
appliance, so we presumed that four-way valve had some problems. We checked circuit, and it was
connected correctly; coil resistance of four-way valve was normal and conducted electricity well, so
four-way valve was blocked: because it was a new appliance, there’s very low chance that four-way
valve was broken. We knocked the four-way valve and started the air conditioner repeatedly; it still
failed to work properly. So finally we confirmed that four-way valve was broken.
Solution: replace four-way valve
Experience Conclusion: don’t replace four-way valve easily, slightly blocked phenomena can be fixed
by simply physical method, especially for the appliance used for a short time.
Case 12 the retaining valve was broken
Unit Model：ASW-H18A4/ III
Phenomena: Poor cooling efficiency
Cause Analysis: voltage of client’s house was 220v. According to client, room was not cooled down
although air conditioner had worked for some time. We checked the air conditioner, low pressure was
0.65Mpa, being relatively high. We released refrigerant until the pressure was 0.55Mpa, cold wind
from outlet of indoor unit was weak, and work current was 7.3A, which was normal. We touched high
and low pressure copper tubes, low pressure tube became colder, but high pressure tube was not cold,
so there’s no failure in compressor. At that time, pressure increased to 0.36Mpa, we touched 4 copper
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tubes, the one connecting discharge pipe of compressor was hot, and other three were also a little hot.
Turned on the air conditioner in heating mode, heating efficiency was also unsatisfactory. So we were
sure that four-way valve had some problems.
Solution: replaced four-way valve, vacuum the system to check leakage sources and finally added
refrigerant.
Experience Conclusion: to fix this kind of faults, we should judge compressor and four-way valve,
which one has problem. Check the pressure and touch the unit with hand to find out fault points. In the
event of gas blowby, temperature difference between inlet and outlet gas is relatively low, gas flow
sound can be heard in valve body, suction force of gas-return pipe of compressor is relatively large
and liquid temperature is relatively high.
Case 13 back valve is broken
Unit Model ：ASW-H12A4/HY
Phenomena ：Seal of back valve is not tight
Cause Analysis: according to client, air conditioner could cool properly, but failed to heat the room.
We turned on the air conditioner, checked the whole unit and found that eudiometer pressure was 14kg,
being relative low, according to fault phenomena, refrigerant in system might be not enough, but we
checked the system and found that balanced pressure was 10kg, and air conditioner could cool normal
in summer, the system didn’t leak, so we presumed that the fault was caused by four-way valve
blowby or poor seal of back valve. Switched on and off four-way valve, valve could operate tightly
and sound of gas discharge was normal. Released refrigerant, vacuumed the system again, added
refrigerant and started the air conditioner again, it still couldn’t work properly. We checked four-way
valve, temperature of its four copper tubes was normal, so we were sure that seal of single-way valve
was not tight, which cause that capillary couldn’t function properly, so the pressure of gas tube was
relative low, and heating efficiency was not so good.
Solution: replaced back valve, vacuum the system and added refrigerant.
Experience Conclusion: back valve can’t close tightly, on high pressure, gas leaks from clearance
between nylon valve block and valve seat, refrigerant fails to enter capillary totally, so air conditioner
fail to produce heat properly, while in cooling mode, single-way valve can work and won’t impact
cooling efficiency.
Case 14 Failed to open the valve enough during installation
Unit Model：ASW-H07B4/HY
Phenomena: Poor cooling efficiency
Cause Analysis: turned on air conditioner for a while, indoor evaporator was frosted, checked the
pressure, it was 3.5kg, relatively low than normal. Added refrigerant and pressure remained
unchanged. Air conditioner continued to work, and after a while, we found that return gas tube of
outdoor unit was frosted, so we presumed that the system was blocked by ice. When we released the
refrigerant, we found that low pressure valve hadn’t opened enough.
Solution: opened the valve fully, adjusted refrigerant pressure to normal value.
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Experience Conclusion: valve is too tight, so system is obstructed and then frosted. When refrigerating
efficiency of new unit was unsatisfactory, do not add refrigerant without careful consideration.
Case 15 Air conditioner was blocked by dirt
Unit Model：ASW-H41A5/A
Phenomena：Poor cooling efficiency, wind velocity didn’t change obviously
Cause Analysis: totally 5 cabinet air conditioners were used in a workshop of a Garment Company,
which occupied an area of 350m2. According to the client, air conditioners were repaired many times
in this year, but they still failed to work properly. We checked the air conditioner, voltage was 380v,
and current was 9A, low pressure was 5kg, which was normal; however, temperature of wind outlet
was relatively high. Based on the forgoing data, we presumed that faults were caused by weak wind.
The main factors may be: 1.fault in fan 2. Fault in capacitor of fan 3. Filter and evaporator were dirty;
4. Fault in control panel. Checked the system, we found that wind was weak, fan and capacitor were in
good condition; adjusted wind velocity (high, intermediate and low), three levels of fan relay closed
with obvious sound, but wind velocity failed to change distinctively. So we judged that fault was
caused by dirt-block of evaporator. Disassembled evaporator and found that there was a great deal of
fiber in it, and it was frosted.
Solution: clean indoor evaporator, wind volume became normal, air conditioners could produce cool
properly
Experience Conclusion: in some special places, for example, garment factories, hair salon, cotton mill
and other places with more dirt as well as public. In such case, poor cooling efficiency was generally
caused by discharge fault, because the system was blocked by dirt. Firstly we should check filter and
evaporator to find out if they were dirty. To fix such kind of fault, we should check surrounding
factors and then checked faults in air conditioners; checked wind volume of indoor and outdoor units,
if ambient temperature is too high; if the two units’ heat exchange properly, finally checked the system
itself.
Case 16 Folding of Connection pipe
Unit Model：ASW-18A4/TA
Phenomenon：Poor cooling efficiency
Cause Analysis: Abnormal sound could be heard in indoor unit. When air conditioner runs for three
minutes and under ventilation mode, no abnormal sound was heard, but when compressor was turned
on, indoor evaporator produced abnormal loud sound of cold flow. Checked the system and found that
outlet tube of indoor evaporator and copper tube of condenser were bent on the junction between the
two tubes.
Solution: replace connection tube
Experience Conclusion: in such case, abnormal flow sound is produced by unsmooth flowing of
refrigerant, and only when we check the system carefully can we find where the line is bent, which is
caused by unprofessional performance of maintenance workers.
Case 17 Bending of connection line
Unit Model：ASF-H24B4
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Phenomena：Refrigerating efficiency was unsatisfactory, outdoor unit stopped to run after it operated
for some time.
Cause Analysis: air conditioner was installed last year, and failed to run properly since then.
Maintenance personnel checked the air conditioner many times, and had following data: running
current was 12.5A, pressure was 5kg.f/com2, inlet wind temperature was 12 Celsius Degree, and
outlet wind temperature was 30 Celsius Degree. From these data, air conditioner was normal, current
of air conditioner rose after it run for some time, outlet wind temperature rose gradually. After 1.5
hours, air conditioner was in protection mode. Maintenance workers judged the outdoor unit was in
heat protection mode, and checked discharge environment of outdoor unit, but condenser was clean
and the outdoor unit was not exposed to the sun. Maintenance workers sprinkled water on the outdoor
unit, it was not in protection mode, so the faults were caused by: 1. faults of compressor; 2 refrigerants
were slightly polluted; 3. problems in line. We checked the system and line, low pressure connection
line was bent where it penetrated the wall, the system was blocked and caused poor cooling efficiency.
Solution: replaced bent line, and air conditioner started to work properly
Experience conclusion: such fault is caused by improper installation, so it is often neglected. To fix
such kind of fault, maintenance workers shall check air conditioner carefully and shouldn’t add
refrigerant or change outdoor unit without careful consideration. Generally, it is bending of connection
line and unsmooth circulation of system that result in fault of air conditioner.
Case 18 Pressure switch was broken
Unit Model：ASF-H41A5/A
Phenomena：Couldn’t produce cooling air
Cause Analysis: Turned on air conditioner for less than 1 minute, “run” indicator and “18”
indicator on control panel blinked, so we presumed that it was in protection mode. High pressure and
low pressure switches worked properly, discharge temperature of compressor is normal. Replaced
outdoor check board, tested the air conditioner, fault remained the same. Turned on air conditioner
again and watched running condition of outdoor unit, we found that air conditioner refrigerated for
one minute, low pressure switch broke off, outdoor unit stopped to work; connected low pressure
protector and tested it, it run normally, low pressure was also normally. So we’re sure that pressure
switch was of poor quality and couldn’t work properly.
Solution: replaced low pressure switch, tested air conditioner and it run properly.
Experience Conclusion: observe faults indicators on control panel which can help us find out causes of
faults.
1. Heating defrosting: “heat “indicator blinks
2. Anti-frozen protection: “run” and “cool” indicators blink
3. Anti-cold wind protection: “run” indicator blinks
4. Over current protection: “run” and “29” indicators blink
5. Low pressure protection: “run” and “18” indicators blink
6. Phase sequence protection: “run” and “time”
7. Fault in Communication: “run” indicator blinks and other indicators extinguish
8. Fault in Sensor: “temperature” indicator blinks
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Case 19 Water entered the system in installation
Unit Model：ASW-H12A4/H
Phenomena：Air conditioner could be turned on but couldn’t produce cool air
Cause Analysis: run air conditioner for 10 minutes, it could cool normally, pressure and current was
normal; air conditioner continued to run, low pressure decreased gradually, current also decreased, and
cooling efficiency became unsatisfactory, so we presumed water entered system when air conditioner
was installed. Because the air conditioner passed quality check when it left the factory, and according
to the client, air conditioner was installed in rainy day, so water might entered the system.
Solution: released refrigerant, vacuum the system and added refrigerant again, air conditioner worked
normally since then.
Experience Conclusion: in most case, these kinds of faults were caused during installation or
maintenance; maintenance workers shall investigate, check and touch air conditioner to find out the
cause of faults.
Case 20 Failed to evacuate air in the system fully during installation
Unit Model ：ASW-18A4/TB
Phenomena： Tripped frequently
Cause Analysis: generally, in summer air conditioner may have problem in heat discharge and voltage.
But this air conditioner had been installed for only one month odd. It was installed on the roof, so heat
exchange efficiency was not so good, but it shouldn’t trip so frequently. We checked the system,
pressure was not so stable, and compressor was overheating, and presumed that air was not evacuated
when the worker installed the air conditioner.
Solution: released refrigerant, because air is lighter than refrigerant, we found there’s air in the
refrigerant obviously. We filled the equipment with refrigerant, air conditioner worked well since then
and it didn’t trip any more.
Experience Conclusion: for air conditioner, installation is more important than manufacture, so
installation workers shall follow installation procedure as they install air conditioners, installation and
wind direction shall be considered. If newly installed air conditioner has problem, they should check
other reason, and then consider possible faults of air conditioner from the simple to the complicated
until fundamental reason is found.
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Chapter 9
Maintenance Cases of Noise and water leakage of AC
Section one
cases of air conditioner noise reduction
Air conditioner noise is a common problem seen in our maintenance work, causes of which shall be
paid attention to. Noise can be classified based on Positions: indoor noise, outdoor noise; based on
sound types: friction noise, wind sound, air flow sound, and electromagnetic sound; based on causes:
assembly problems, structure design problems, components and parts quality problems and
installation problems. We shall distinguish sound types, positions and causes of air conditioner noise,
and deal with the problems accordingly.
⒈ Common noises of indoor unit
⑴Dirt in indoor unit
⑵Indoor fan motor axis, poor concentricity and fix screw becoming loose
⑶Poor concentricity of indoor fan, blade breakage and wearing of left blade axis bush
⑷Loosing of the panel and the auto-switch
⑸Abnormal sound (friction sound from connection parts) from step motor and horizontal air blade,
⑹Whistle (poor balance of blades, if necessary change a blade; or 25A failure of evaporator itself)
⑺Refrigerant flow sound of indoor unit (line bending position 32M and capillary 100S)
⑻Air inlet was obstructed because of dirt filter
2. Common noises of outdoor unit
⑴Loud noise from compressor
⑵Tube vibrating and touching outdoor casing
⑶Whistle from blades (blade breakage)
⑷ Loud sound from outdoor fan motor( replace 70W ， 930rmp,YDK48-6-354 3UF with
YDK48-6A-354 4UF)
⑸Outdoor blade touching outdoor casing, condenser or steel grille
⑹Sympathetic vibration of outdoor unit, especially removing the motor bracket of the small outdoor
unit
⑺Outdoor steel grille colliding with outdoor casing
⑻Indoor unit motor frame becoming loose
⑼Air conditioner installation holder becoming loose
⑽Improper installation position of outdoor unit
⒊ Method to find noise positions
⑴Denying one by one: When it is difficult to find noise sources, for example, to decide it’s
compressor or outdoor motor producing noises, firstly we should break off compressor, and listen if
outdoor motor produces noise, if not, it’s compressor creating noises.
Case 1: Blade axis of indoor unit colliding with rubber seat
Unit Model：ASW-H12B4/HY
Phenomena： Loud indoor noises
Cause Analysis: indoor unit creates same sound in both cooling and ventilation modes, with similar
fault phenomena. Noise was louder when air conditioner was turned on. Removed panel and shell of
indoor unit, fault still remained the same and sound came from left bearing, so maintenance personnel
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presumed that fault was on bearing bush of left blade. Replaced bearing bush, noise could still be
heard. Maintenance personnel checked wind blades and found that they’re installed left to the center
and blade axis touched rubber seat of bearing and produced noise when running.
Solution: move wind blade to right by 2mm and noise was eliminated.
Experience Conclusion: foregoing noises also can be created from following problems:
⑴ Screw of fix motor gland becoming loose
⑵ Bearing seat left to indoor fan becoming loose
⑶ Oily bearing left to indoor fan is broken or lacks
oil;
⑷ Left axis of blade colliding with rubber bearing
holder
⑸ Fix screw of indoor fan becoming loose;
⑸ Two ends of indoor fan colliding
⑺ Chassis has deformed and collides with blades
⑻ Blades trip too excessively and collide with
chassis
⑼ Blades being broken
Case 2 : Indoor fan motor noise
Unit Model ：ASF-H18A4/FSY
Phenomena： Whistling from indoor unit
Cause Analysis: air conditioner was newly installed, during test running, air conditioner made
whistle-like noise. Maintenance personnel presumed that it was caused by blades. Maintenance
personnel replaced blades of the same model, but noise remained the same. Replaced the motor with
an YDK30-8-155 motor produced by Jiangsu Weiteli Co., replaced capacitor with a new one of 3.5µF
YDK30-8A, noise cleared off. We analyzed faulty motor and found that amplitude and frequency
produced by running motor vibrated with unit shell and wind system, and interfered with air flow.
Solution: replaced indoor fan motor
Experience Conclusion: indoor unit noise is generally resulted by blades or motor, if it is difficult to
decide the fault source, we can adopt method of denying one by one.
Case 3: Wind Sound of H-Series Air Conditioner
Unit Model：ASW-H12A4/HS
Phenomena：Wind sound of indoor unit
Cause Analysis: when indoor unit was running, wind sound varied with the swing of fan blades;
according to our analysis, plastic-sealed motor or controller has some faults, change motor and
controller, faults remain the same. Maintenance personnel pushed on manual swing button; wind
sound disappeared, so the reason was as follows: when air blades swung, wind outlet area varied;
when it swung to the top position, outlet area was smallest; wind was obstructed and produced wind
sound.
Solution: replaced the faulty controller with Motorola chip controller
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Experience Conclusion: the said noise is wind sound, which isn’t beyond noise standard. In such case,
do not change motor or controller without careful consideration.
Case 4: Noise produced by friction between fan blade and wind baffle
Unit Model No：ASF-H24B4/FSY
Phenomena：Noise in outdoor unit
Cause Analysis: We run the air conditioner when we finished installation, outdoor unit produced
unpleasant sound, and we suspected outdoor fan was broken or steel casing scraped with each other.
Opened the cover of outdoor unit, rotated fan with hand, no noise was heard; turned on air conditioner
again, we found that blade collided with wind baffle and produced noise. Maintenance personnel
failed to insert wind baffle in locating slot.
Solution: inserted wind baffle into locating slot, the noise was eliminated.
Experience Conclusion: if there’s noise in outdoor unit, attention should be paid to decide what kind
of noise it is: friction noise or resonance vibration noise or magnetic noise, and then deal with it
accordingly.
Case 5: Fix screws of fan blade loosed
Unit Model：ASW-12A4/M
Phenomena：Indoor unit noise
Cause Analysis: air conditioner was newly installed, and it didn’t make noise during test running.
Noise occurred one month later. Maintenance personnel suspected that there’s foreign substance in
indoor air duct or problem was caused by improper installation. We opened indoor unit but didn’t find
anything wrong. When we rotated wind wheel with hand, and found that fan blades moved to the left
and right and collided with shell because of the loose screws. We tightened the screws, air conditioner
worked properly since then.
Solution: adjusted position of wind wheel and tightened fix screws.
Experience conclusion: if noise can be heard even the air conditioner works in ventilation mode, fan
wheel should be checked first.
Case 6: Noise caused by friction in actuating mechanism of air blades
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Unit Model: ASW-12A4/A
Phenomena：Indoor Noise
Cause Analysis: the air conditioner was newly installed; according to client, noise of indoor unit was
loud. Maintenance personnel of service network visited the client and checked the air conditioner
many times and believed the appliance worked well, so client was unhappy. We checked the air
conditioner and found that air blades made noise sometimes. We adjusted the position of air blades,
and added some lubricate, the air conditioner worked well since then.
Solution: adjusted position of air blades, and filled with some lubricant
Experience Conclusion: if maintenance personnel suspect noise is caused by air blades, he can stop
swing of air blades, and sees if noise still can be heard. Main causes for noise from air blades are: 1. it
is fixed too tightly, 2. there’re burrs on transmission pole3. Concentricity of air blades is not so good.
If maintenance personnel find the cause, he can deal with the problem accordingly.
Case 7: Outdoor fan motor noise
Unit Model: ASW-H12A4/HY
Phenomena：Outdoor unit made abnormal sound and vibrated
Cause Analysis: broke off compressor and run outdoor fan, noise still could be heard. Removed the
blades, run the fan again, we found that poor concentricity of bearings made them collide with each
other and made noise. We replaced outdoor fan motor, and abnormal sound was eliminated.
Solution: replaced outdoor fan motor
Experience Conclusion: small fault is likely to be neglected, generally, people believe that vibration of
outdoor unit is caused by unbalance of fan blades, but in fact, improper clearance of air outlet grille
also can cause noise. So maintenance personnel should check carefully so as to reduce the chance of
making mistake.
Case 8: Noise caused by vibration and collision of copper tube
Unit Model: ASW-12A4/HSY
Phenomena：Copper tube vibrated and made noise
Cause analysis: turned on the newly installed air conditioner, found that outdoor unit vibrated
abnormally, opened the shell, we found that compressor, fan motor and fan run normally; touched
copper tube, it vibrated severely, so it was copper tube making noise.
Solution: applied anti-vibration agent on copper tube
Experience Conclusion: generally, exhaust tube and air returned tube are likely to vibrate when air
conditioner operates, which can be checked visually or touched by using screwdriver. Install damp
piece or insulation sleeve on the position vibrating most severely. Noises of tube are caused by
following reasons:
⑴ Copper tube is too close to compressor, and when compressor runs, it causes tube vibrating. We
can install insulation sleeve on the tube；
⑵ Copper tube is too close to sheet-metal pieces, vibration of compressor causes collision between
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tube and sheet-metal. We should install damp piece or insulation sleeve.
⑶ Vibration of compressor causes collision between copper tubes. Install insulation to isolate two
tubes.
In such case, we should explain to client that it’s not air conditioner fault, it is caused by improper
installation and can be handled easily.
Case 9: Outdoor fan motor bracket deformed because of the vibrating
Unit Model: ASW-12A4/HY
Phenomena：Outdoor unit made loud noise in operation
Cause Analysis: air conditioner buzzed when it was in cooling mode. Maintenance personnel judged
that sound was made by outdoor unit. Opened outdoor shell, checked the internal tubes and
compressor and found that they operated normally. So maintenance personnel suspected noise was
made by outdoor fan. Turned off compressor, noise was still very loud. Changed fan motor, but noise
remained the same. Check carefully and found that fan motor bracket bent; adjusted the bracket
vertically, installed fan again, and run the air conditioner, buzz was eliminated.
Solution: adjusted outdoor fan
Experience Conclusion: to reduce noise, more attention shall be paid to stability of auxiliary support
and fasteners and whether they have deformed.
Case 10: Outdoor grille collided with front panel
Unit Model : ASW-H07B4/Y
Phenomena：Outdoor unit made loud noise
Cause Analysis: according to client, outdoor unit made loud noise. We checked outdoor unit and it was
installed properly, its shell was also quite normal. Touched the cover of outdoor unit, noise was
reduced, but not eliminated and outdoor grille made slight quaver. Compacted or pulled out this grille,
noise was eliminated. Checked carefully and found that plastic clip between grille and front panel
hadn’t been fastened tightly and made noise.
Solution: filled small plastic cushion between outdoor grille and front panel and avoided impacting the
appearance of the outdoor unit.
Experience Conclusion: compared to indoor unit noise, outdoor unit noise can be eliminated easily,
the most important thing is to find out the right orientation and handle the problem smartly.
Case 11: Noise caused by blocking of indoor separate capillary
Unit Model: ASW-H24B4
Phenomena: Outdoor unit made loud noise and cooling and heating efficiency was unsatisfactory.
Cause Analysis: indoor unit produced air-stream sound, temperature difference of air outlet was only
7 Celsius Degree and low pressure was 0.3 MPa, both data were relatively low; high pressure tube was
over-cold, and compressor was easy to change to over-heat protection mode. Broke off compressor,
noise disappeared; broke off indoor fan, refrigerant made loud noise, so maintenance personnel judged
that noise was caused by flow throttling. Touched branches of evaporator, and found that temperature
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of two back branches was obviously lower, so system was blocked when it was welded. Released
refrigerant, welded the system again and fault was eliminated.
Solution: welded the copper tube again, air conditioner run normally
Experience Conclusion: generally, air-stream sound was produced by over throttling, so we shall
analyze causes for throttling.
Case 12: Noise caused by bending of connection pipe
Unit Model: ASW-H12A4/M
Phenomena：Indoor unit made loud noise
Cause Analysis: opened the indoor unit and checked all components, we found that when compressor
run, it made noise, so air duct, motor and other components had no problem. We checked the
components of evaporator and listened to the sound and then found that noise was made by evaporator.
Gas pipe pressure was relatively lower than normal value; we continued to check and found that
connection pipe between indoor and outdoor units was folded badly.
Solution: after we replaced deformed part of connection pipe, the foregoing faults disappeared.
Experience Conclusion: only when air conditioner is in cooling and heating modes can noise be heard,
so gas pipe, motor and components have no problems. Check the system carefully, whistle is from
evaporator, which has been blocked with dirt and ice or blocked when the tube is welded. Decide the
fault position through listening, visual check and measuring temperature difference, and then deal with
the faults accordingly.
Case 13: Noise caused by improper installation
Unit Model: ASW-H12A4/ED
Phenomena：Abnormal noise could be heard after the air conditioner was turned on and run for some
time.
Cause Analysis: according to client, “coo” could be heard occasionally. Maintenance personnel
checked the air conditioner for about 3 hours, “coo” could be heard sometimes, we believed it was
from water collection pan in indoor unit when air condition was in cooling mode, and water drain pipe
might have some obstacles. We checked the pipe from indoor unit to outdoor unit carefully, and found
that water drain pipe in indoor unit was tied too tightly, and water couldn’t flow smoothly; water line
outside had a U type bending, so we considered that air flow returned sometimes and produced
abnormal sound. Because water pipe was not flat completely, water could still be drained and indoor
unit didn’t leak, it was very difficult to find the problem. We wrapped water pipe again, and adjusted
water pipe of outdoor unit, and then air conditioner could operate properly.
Solution: adjusted water drain pipe
Experience Conclusion: to deal with such kind of strange problems, maintenance personnel shall be
patient to check and consider in various aspects.
Case 14: Noise caused by improper outdoor unit installation
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Unit Model: ASW-H24A4/TB
Phenomena：Outdoor unit made loud noise according to client
Cause Analysis: according to client, noise made by air conditioner was not so loud in the daytime, but
it was much louder at night. We turned on air conditioner; outdoor unit noise could be heard in the
room. Checked the air conditioner, noise from it was quite normal; but it was installed in balcony,
which was only separated from bedroom by a wall, and air conditioner was installed under the
window and sound could be transmitted directly to the room.
Solution: Moved outdoor unit to a suitable place, noise was reduced.
Experience Conclusion: if possible, do not install outdoor unit, especially large power outdoor unit on
balcony.
Case 15: Heat expansion sound of plastic components
Unit Model: ASW-H12A4/H
Phenomena：When the air conditioner was turned on and off, clap could be heard sometimes.
Cause analysis: indoor unit made clap-like sound, plastic components of indoor unit produces sound
of heat expansion; opened panel and run the air conditioner; noise was eliminated, so we presumed
that water collection pan was too close to plastic panel, which may expand when temperature rises.
Solution: cut brink of plastic water collection pan with knife, turned on air conditioner again, noise
was eliminated.
Experience Conclusion: special faults shall be handled with special methods.
Section two
maintenance cases for water leakage of air conditioner
There are various causes for air conditioner water leakage, we should check carefully to find leak
source and deal with the problems accordingly. In general, water leak can be analyzed from following
aspects:
⑴ Air supply system: Filter is blocked by dirt. In moisture environment, if air conditioner is operating
in low wind mode, wind amount is relatively small and indoor evaporation temperature will decrease
and evaporator will be frosted or even frozen. If such condition remains for a long time, air
conditioner will leak.
⑵ Drainage system: mainly includes guiding channel, drain pipe, pipe wrapping and discharge pump
faults, when air conditioner has been used for a long time, guiding channel and drain pipe may be
blocked by dirt, plastic guiding channel may crack, connection joints of pipe may be wrapped
improperly and drain pipe may be flattened, all these will result in water leakage.
⑶ System lacks in refrigerant or evaporator is blocked: when system lacks in refrigerant, refrigerant
will be gasified quickly in 2-3 pieces of U-shaped tubes near inlet tube after it enters evaporator, so
temperature of fins of these U-shaped tubes is relatively low, but temperature of others is close to
room temperature, so water in fins of these 2-3 U-shaped tubes will condense and will freeze after a
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long time. When evaporator is blocked by ice, fins of U-shaped tubes with large refrigerant flow will
be in low temperature, while those with small refrigerant flow will be in higher temperature, so
temperature difference between two circuits will be relatively large, which will produce a large
number of condensate in the former fins. Condensate is blown outside the outlet with wind. In
addition, cold and hot air meet in wind pipe and steam condenses in air pipe, causing water leakage.
⑷ Improper installation: newly installed air conditioner or air conditioner installed in winter may leak
because of non-levelness of air conditioner or improper wrapping of drain pipe or connection joints.
Case 1: Filter was blocked by dirt
Unit Model: ASW-H12A4/M
Phenomena：Indoor unit leaked water
Cause Analysis: Cause Analysis: after air conditioner operated in cooling mode for some time, water
dropped between front panel and upper air outlet grille, but wind amount was relatively small. We
opened the cover, and found that filter was blocked by dirt and wind amount decreased, so evaporate
temperature fell, evaporator was frosted and connected with dirt filter. Removed the filter, turned on
air conditioner again, we found wind amount increased and water didn’t leak again.
Solution: we cleaned filter, installed it again, and asked client to clean and maintain the filter
regularly.
Experience conclusion: air conditioner is likely to leak if filter is dirty and blocked, so we shall
instruct client to clean filter and maintain air conditioner regularly. In addition, it is difficult to
distinguish frost of evaporator and frost due to refrigerant lack of system. If system lacks refrigerant,
evaporator will be frosted, generally on the inlet; if filter is blocked, air returned tube (low pressure
tube) of system will be frosted.
Case 2: Indoor unit leaked water in low wind mode
Unit Model: ASW-H12B4/TD
Phenomena：Beads dropped form air outlet
Cause analysis: according to client, water was blown form air outlet after air conditioner run for 2 or 3
hours, maintenance personnel observed the phenomena and found that tiny bead was blown from air
outlet when air conditioner was in low wind mode. Air conditioner was used in a 15 m2 room, and set
temperature was 17 Celsius Degree, evaporation and exchange amount decreased when temperature
dropped, so too much condensate was produced and blown outside the air outlet.
Solution: changed low wind mode to high wind mode (or automatic mode), set temperature on 24
Celsius Degree, condensate never occurred again.
Experience Conclusion: foregoing fault was caused by physical factors, so the only thing need do is to
explain to client. Fog blown from air conditioner is more common in rain season, in addition, in
southern China, raininess, low ambient pressure and high humidity may result in such problem. To fix
the problem, we should check evaporator and fan blades to see if they’re clean; if they’re clean, we
should operate air conditioner in high wind and high temperature mode.
Case 3: Guiding channel was blocked and leaked water
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Unit Model: ASW-12A4/M
Phenomena：Indoor unit leaked water
Cause analysis：air conditioner had been used for two years and never leaked water before, so it was
not caused by improper installation, it was possibly caused by obstruction in water drain pipe. When
air conditioner worked for a long time, condensate leaked from notch of basement connection tube.
We checked the appearance of air conditioner, it was installed on a level plane and filter had been
cleaned. Removed the panel, we found that evaporator was clean; filled the evaporator with water, it
didn’t leak, and could drain water smoothly. We disassembled evaporator and water flowed from
connection notch of basement. Removed indoor unit from wall, we found that rear guiding channel
had been blocked by sand, and water spilled over from channel. The main reason of block was that
wall was affected with damp and became loose, indoor unit vibrated when it operated, so sand fell into
channel.
Solution: cleaned foreign substance in channel and installed anti-moist plastic cushion to avoid sand
falling into air conditioner again.
Experience Conclusion: causes for leakage of M Series air conditioner are various, mainly including
following aspects:
⑴ Connection position of left motor bracket and water collector channel has an aperture because of
faulty injection mould, and water leaks from it;
⑵ Top of right side of water collection channel has a small aperture because of faulty injection mould
and water leaks form it;
⑶ Insulation sponge on the outlet of air blades is not appropriate affixed or insulation sponge has fall
off, so that condensate drops from the outlet.
⑷ Design of air blades is unreasonable and causes condensate dropping from it.
Solution:
⑴ In 1 and 2 cases, aperture can be filled with glass cement or ironed out with electric iron.
⑵ In third case, we shall affix insulation sponge(38×36×5mm, cutting a Φ17mm hole in the center)
properly, detailed to see Picture (1).
⑶ In the fourth case, we shall affix a 15×10×10mm PE sponge on air blades support to stuff air
blades and change zero position of stepping mode to avoid non-uniform wind of air blades.
To find out cause of leak, we shall pay attention to following aspects:
⑴ Observe air conditioner carefully before maintenance and investigate use condition, do not
disassemble air conditioner without careful consideration and cause more faults;
⑵ In case that two-folded evaporator leaks water, because it has two guiding channels, back guiding
channel is sometimes neglected by maintenance.
⑶ There are many causes for leak of air conditioner, such as structure, assembly, system,
environment and installation problems, we shall observe air conditioner carefully to find leak source,
and then deal with the problems accordingly, so that we can get twice the result with half the effort.
Case 4: Water barrier leaked water
Unit Model ASW-H09A4/ED
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Phenomena：Indoor unit leaked water
Cause analysis：We turned on air conditioner, found that air pipe of indoor unit leaked, especially on
left and right ends. This air conditioner adopted four-folded evaporator, two water collection channels:
upper and down, upper channel was on the back of evaporator, where a water barrier guided water to
upper channel, condensate flew from two ends of water barrier, which were affixed with sponge, to
indoor unit.
Solution: adjusted sponge on water barrier; air conditioner did not leak again.
Experience conclusion: ED-Series air conditioner adopted four-folded evaporator, leak of which is
caused by many factors, including following aspects:
⑴ Guiding plate is not installed (in such case, air conditioner leaks badly, condensate will be blown or
flown from air duct.)
⑵ Tubing angle of evaporator is not proper;
⑶ Sponge on evaporator has fallen off.
⑷ Evaporator and plastic mould basement fail to fit tightly
⑸ Sponge on water guiding plate is not affixed properly.
During maintenance, we should check air conditioner carefully to find leak source and find water leak
condition: dropping or weeping, and then deal with the problems accordingly; in this way, we can get
twice the result with half effort.
Case 5: Condensate leaks from connection line joint
Model No: ASW-H12A4/HB
Cause analysis：Water dropped from connection tube in indoor unit, we suspected condensate leaked.
We checked the air conditioner and found that insulation sleeves of high and low pressure connection
tube of indoor unit were of poor insulation efficiency, which caused leak of condensate. Solution:
Re-wrapped connection tube joints with insulation sleeves (the more belt is wrapped, the better
insulation efficiency will be).
Experience Conclusion: insulation sleeve and tube are of same length when air conditioner leaves
the factory, so before wrapping connection tube, power wire and water drain line, and maintenance
personnel shall measure length difference between inlet and outlet tubes of evaporator, reserve space
for connection tube. Because expansion capacity of insulation sleeve is different, to obtain good
insulation effect, we shall wrap insulation tightly with belt, so that insulation sleeve on tube joint will
not be loose and cause joint cap being exposed and leaking water. In addition, tube joint shall be
affixed with water-proof adhesive tape, or it is likely to leak. Foregoing leak is caused by improper
installation, so for newly installed air conditioner, such problems shall be noticed.
Case 6: Water drain tube was flattened and leaked
Unit Model: ASW-H12A4/H
Cause Analysis： According to client, the newly installed air conditioner leaked water. We checked
and found that indoor unit was installed in a level plane; the hole on the wall was lower than indoor
unit and drain tube of indoor unit was not broken; later, we found that discharge amount of outdoor
drain tube was relatively small, but indoor unit leaked water, so water drain tube might be obstructed.
For it was a new air conditioner, it’s impossible that the system had been blocked. Finally, we found
that water drain tube was wrapped under other lines as all lines penetrating the hole on the wall, so
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AUX air conditioner service manual
water couldn’t flow smoothly and water drain tube leaked.
Solution: adjusted position of water drain tube.。
Experience Conclusion: pay attention to details during installation and have water drain test after
installation.
Case 7: Water Drain Tube wasn’t wrapped tightly enough and leaked condensate
Unit Model: ASW-07B4/HA
Phenomena： After air conditioner run for half an hour, water drain tube of indoor unit was full of
condensate and leaked water.
Cause analysis: according to client, indoor unit of newly installed KF-23GW/I1Y air conditioner
leaked. We turned on the unit for half an hour, 2m water drain pipe of indoor unit was covered by
beads; we noticed that the office neared riverside, so environment humidity was relatively high, in
addition, room was also large and closeness was poor, so a great deal of condensate was discharged
from indoor unit; because drain tube was only wrapped by a layer of adhesive tape, air condensed on it
and produced water.
Solution: wrapped the outer wall of drain tube with more insulation sponge, and tied the insulation
sleeve tightly
Experience Conclusion: in southern area with high humidity, heat insulation sponge shall be wrapped
properly.
Case 8: Water drain tube was broken and leaked water
Unit Model: ASW-H09A4/M
Phenomena：Turned on air conditioner for a while, indoor unit discharged a large amount of water, but
outdoor drain tube didn’t discharge condensate water.
Cause Analysis: the main reason of leakage was that water drain tube connecting indoor unit and
water collection pan as well as drain tube outside the unit were bitten through by mice.
Reasons for damage during installation:
⑴ Water drain tube is broken when it is pulled out from indoor unit( especially cabinet unit), because
steel casing parts are too sharp without folded edges or other protection measure;
⑵ When connection pipes and water drain pipe penetrate the wall, if hole on the wall is not large
enough, it may break the drain pipe;
⑶ Other reasons: Drain pipe is of poor quality and thickness is very thin; drain pipe connecting with
water collection pan is of poor quality, and leaks condensate; drain line is bitten through by mice and
so on.
Solution: replace broken water drain tube, check if drain tube will be broken again easily and take
proper protective measures.
Experience Conclusion: take cautious steps to protect drain tube and do not damage it during
installation.
Case 9: System leaked water because of refrigerant lack
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AUX air conditioner service manual
Unit Model: ASW-H09A4/A
Phenomena：Air conditioner leaked water after running for some time, evaporator was frosted or
frozen.
Cause Analysis: according to client, indoor unit leaked water. We turned on air conditioner and
observed, after 10 minutes, water started to be blown from indoor fan. Disassembled shell, we found
that 2-3 U-shaped fins near evaporator were very cold and covered with condensate, and other fins
were not so cold; turned on the air conditioner again, and it run in refrigeration mode for more than 20
minutes, fins near evaporator were frosted slightly. System pressure was very low (3KG), so system
lacked in refrigerant seriously; refrigerant gasified in fins near input tube when it flew into evaporator,
so temperature of these fins were very low, but temperature of other fins closed to room temperature,
and then fins of low temperature produced condensate, which was blown through outlet with wind; 20
minutes later, evaporator was frosted or frozen.
Solution: checked leak sources and found that connection tube was not connected correctly with low
pressure valve body, and so lock position of nut leaked refrigerant. Connected the tube again and
tighten the nut, vaccumized the system and filled with refrigerant, air conditioner worked well since
then.
Experience Conclusion: air conditioner leaks water, if indoor heat exchanger doesn’t leak air, touch
heat exchanger at different positions to judge whether there’s obvious temperature difference, so as to
judge whether condensate is caused by system problem (generally, if water leak is caused by system
problem, we can see tiny beads inside air duct and obvious beads c on fan blades.)
Case 10: Evaporator was half-blocked and leaked water
Unit Model: ASW-12A4/HSFY
Phenomena：Air conditioner leaked water after running for some time
Cause Analysis: according to client, air conditioner leaked water after running for some time. We
turned on the air conditioner and it run for 20 minutes, water started to be blown form indoor unit.
Disassembled front shell, we found that 2-3 U-shaped fins near evaporator were very cold and covered
with condensate, and other fins were not so cold, so we suspected that system lacked in refrigerant.
Measured system pressure, but it was normal. Later, we found that these fins were covered with beads.
Putting hand on air outlet, we could feel there’s water flowing out with air; we touched fins with
hands, and found temperature of different fins was different obviously, so we suspected that part of
evaporator was blocked and caused deflection of refrigerant; temperature of fins with large refrigerant
flow was low, and that of fins with small refrigerant flow was high, and large temperature difference
cause fins with large refrigerant flow condensed and water was blown outside with wind.
Solution: replaced evaporator after consulting with client, air conditioner worked well since then.
Experience Conclusion: it is easy to judge water leak because of partial block or weld block: whole air
duct is full of tiny beads, and beads can also be seen on fan blades.
Case 11: System leaked air
Unit Model: ASW-H12B4/HDY
Cause analysis：We operated the newly installed air conditioner, fan blades of indoor unit sprayed
beads. We checked and found that air conditioner was installed on a level plane, water pipe was
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AUX air conditioner service manual
smooth, and water drain tube could discharge water normally. We opened indoor unit shell, checked
and found that evaporator and basement were assembled properly, but there’s a leak between left
bracket and left fin of evaporator, which leaked air. Affixed the leak with sponge and turned on air
conditioner again. Water leakage was reduced, but fault hadn’t been eliminated. Opened indoor unit
panel again, and checked temperature of different streams of evaporator and U shaped fins and found
that temperature difference was very large, so flow deflected in evaporator. Checked air return
pressure of low pressure valve and found that it was very low (3kg).
Solution: filled the system with refrigerant until system pressure exceeded ambient pressure; run air
conditioner for 20 minutes, there’re no beads seen on fan blades, so fault had been eliminated.
Experience Conclusion: if air returned temperature and air outlet temperature is different obviously,
and return air way of evaporator is large, hot air will mix in air chamber and produces condensate,
which will attach on fan blades and sprays outside the unit. If surface temperature of evaporator is
uneven, same fault will occur. We can handle the problem of uneven temperature on the surface of
evaporator by increasing or decreasing refrigerant according to air returned pressure of low pressure
valve and ambient temperature. If temperature difference on evaporator exceeds 9 Celsius Degree,
evaporator is blocked partly, so it shall be replaced with a new one.
Case 12: Flush air conditioner leaked water
Unit Model: ALCa-H41A5
Phenomena：Indoor unit leaked and running indicator blinked
Cause analysis: water spilled over from water collection pan, we checked drainage condition of water
drain pipe, and found drain amount was very small, so we judged that drain pump failed to drain water
properly
Solution: replaced water drainage pump
Experience Conclusion: drainage method of flush air conditioner is different with split units, the later
can discharge water without any other equipment, but the former shall have discharge pump to drain
water. If air conditioner leaks, discharge pump shall be checked first. Blinking of running indicator
also proves that air conditioner is in water drainage protection mode. Of course, leak of flush air
conditioner also can be resulted by non-plainness of water discharge pump. We shall analyze causes
carefully when we repair air conditioner.
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AUX air conditioner service manual
APPENDIX 1
Introduction to the fault display CODE of AUX air conditioner
1. 70S .100S.120S.45T.50T.60T45TA.50TA.60TA.70T1，when the faults happen, the LCD panel
displays “fault” and the corresponding code.
⑴ The fault of the indoor plastic temperature sensor：
System turns off, the panel displays “E1”.
⑵ The fault of the outdoor tube temperature sensor on the indoor panel：
System doesn’t turns off, the panel displays “E2”.
⑶ The fault of the indoor copper tube temperature sensor：System doesn’t turns off, the panel
displays “E3” and keep on working as per the mode without indoor copper tube temperature
sensor.
⑷ When the outdoor panel available，the communication fault：
System turns off; the panel displays“E4”.
⑸ When the outdoor panel available，the outdoor compressor under self protection(overloading
protection)：
System turns off, the panel displays “E5” (The fault may be the low on-off voltage protection,
overloading protection or the reacting motion of the overloading relay).
⑹ When the outdoor panel available，the outdoor three phases’ self protection against failure of
phase：
System turns off，the panel displays “E6”，(The fault may be the three phases are in reverse).
⑺ When the outdoor panel available, over-current protection:
System turns off，the panel displays “E7”.
⑻ When the outdoor panel available，the fault of the temperature sensor to the exhaust pipe of the
compressor：
System doesn’t turns off, the panel displays “E8”. (The fault may be the unsteadiness of the joint &
plug or the fault of the outdoor computer board)
⑼ When the outdoor panel available，the temperature protection of the discharge pipe of the
compressor：
System turns off; the panel displays “E9”.
2、ASW-H18A4/TBPModel transducer faults display
Indoor unit faults display:
⑴ Fault 11
The indoor ambiance temperature sensor is open circuit or short circuit.
⑵ Fault 12
The tube temperature sensor of the indoor heat exchanger is open circuit or short
circuit.
⑶ Fault 13
Indoor heat exchanger anti-freezing protections.
⑷ Fault 14
Indoor heat exchanger overheating protection.
⑸ Fault 15
Indoor communication fault.
⑹ Fault 16
Indoor electric source’s instant off
⑺ Fault 17
Indoor over-current protection
Outdoor faults display:
⑴ Fault 21
The outdoor ambiance temperature sensor is open circuit or short circuit.
⑵ Fault 22
The tube temperature sensor of the outdoor heat exchanger is open circuit or
short circuit.
⑶
Fault 23
The temperature sensor of the air vent of the outdoor compressor is open circuit or
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AUX air conditioner service manual
short circuit.
⑷
Fault 24
No load.
⑸
Fault 26
Outdoor over-current protection.
⑹
Fault 28
Outdoor voltage abnormal.
⑺
Fault 29
Outdoor electric source’s instant off.
⑻
Fault 2A
Outdoor refrigeration’s overloading protection.
⑼
Fault2B
Outdoor defrosting display.
⑽
Fault 2C
IPM module fault.
⑾
Fault 2d
Outdoor E2 data fault.
Simultaneously press the key of “hour”, “minute” again and last for 2 seconds. Resume displaying the
temperature after the sound of the buzzer.
3、ASF-H24B4/A,ASF-H41A5/A,ASF-H41A5/C faults display and protections display
⑴ Heating and defrosting：
The “heating” indication light on the panel is twinkling, （0.5/0.5），the others are invariable.
⑵ When the indoor tube temperature available, the indoor refrigeration anti-freezing protection：
The “running” and the “cooling” indication light on the panel is twinkling（0.5/0.5），the others are
invariable.
⑶ When the indoor tube temperature available, the indoor heating over-heating protection：
The “running” and the “heating” indication light on the panel is twinkling（0.5/0.5），the others are
invariable.
⑷ When the indoor tube temperature available, the indoor heating long time anti-cooling wind
protection：
The “running” indication light on the panel is twinkling（0.5/0.5），the others are invariable.
⑸ Over-current protection:
The “running” light and “29” indication light on the panel are twinkling and simultaneously last for
0.5/0.5 second, the system turns off.
6、Low pressure protection：
The “running” light and “18” indication light on the panel are twinkling and simultaneously last for
0.5/0.5 second, the system turns off.
⑺ Fault of the indoor temperature sensor：
The “temperature” indication light on the panel is twinkling and last for 0.5/0.5 second, the system
turns off.
⑻ Fault of the indoor coil pipe sensor：
The “temperature” indication light on the panel is twinkling and last for 0.5/0.5 second, runs without
the interior tube sensor.
⑼ The outdoor coil pipe sensor and the compressor discharge sensor fault：
The “running” indication light on the panel is twinkling and last for 0.5/0.5 second，the others are
invariable.
⑽ Outdoor failure of phase or the phases sequence protection:
The “timing” light and “running” light on the panel are twinkling and simultaneously last for 0.5/0.5
second, the system turns off.
⑾ fault of Communication:
The “running” light on the panel is twinkling and last for 0.5/0.5 second, the other indication lights are
off, and the system turns off.
⑿ Compressor discharge protection:
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AUX air conditioner service manual
The “running” light and “swing” light are twinkling and last for 0.5/0.5 second, the other indication
lights are invariable, and the system turns off.
4. ASF-H24B4/B, ASF-H41A5/B faults display and protection display:
⑴ Fault of the Indoor temperature sensor：
System turns off; the panel displays “E1”
⑵ The fault of the outdoor tube temperature sensor on the indoor panel：
System doesn’t turn off; the panel displays“E2”.
⑶ Fault of the interior tube temperature sensor：
System doesn’t turn off, the panel display “E3”，runs under the mode without interior temperature
sensor：When under the heating mode, there is no overheating protection, anti-cooling wind protection
and residual heat removal function, the indoor fan starts running at the setting fan speed 30 seconds
later after the compressor’s starting, and stops after 30 seconds running at the ultra low fan speed
without compressor; When under the refrigeration mode, there is no anti-freezing protection.
⑷ Communication fault：
The system turns off or can’t start, the panel displays “E4”，which may be displayed under either on or
off status.
⑸ The protection of outdoor reverse phase and failure of phase:
System stops, and the panel displays “E6”
⑹Heating and defrosting：
The “defrosting” indication light on the panel is twinkling, (0.5/0.5) the other are invariable.
⑺ When the indoor tube temperature available, the indoor refrigeration anti-freezing protection：
The “running” light and “cooling” light on the panel are twinkling (0.5/0.5), the other are invariable.
⑻ When the indoor tube temperature available, the indoor heating overheating protection：
The “running” light and “heating” light on the panel are twinkling (0.5/0.5), the other are invariable.
⑼ When the indoor tube temperature available, the indoor heating long time anti-cooling wind
protection：
The “running” light on the panel is twinkling (0.5/0.5), the other are invariable.
5、ASW-(H)18A4/III fault display and protection display
⑴ Damage to the outdoor coil pipe：
The timing light on the panel twinkles one time/second.
⑵ The damage to the indoor temperature sensor：
The timing light on the panel twinkles one time/8 seconds.
⑶ The damage to the indoor coil pipe sensor：
The timing light on the panel twinkles two times/8 seconds.
⑷ Heating and defrosting
The sleeping light twinkles (0.5/0.5 second）
⑸ Refrigerating anti-freezing protection：
The operation light and the timing light of the panel twinkle (0.5/0.5 second）
6、Heating anti-overheating protection：
The “running” light and “sleeping” light are twinkling（0.5/0.5second）
⑺ Heating long time anti-cooling wind protection：
The “running” light is twinkling（0.5/0.5second）
6、FS(Y)、DS(Y) 、ZVY、CSY model air-conditioner faults display and protection display
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AUX air conditioner service manual
When the faults happen, the LED digital screen of the operation panel displays the corresponding
code.
⑴ Fault of The indoor temperature sensor：
System turns off, and the LED digital screen of the operation panel displays “E1”.
⑵ Fault of the outdoor tube temperature sensor on the indoor panel：
System doesn’t turn off, and the LED digital screen of the operation panel displays “E2”.
⑶ Fault of the indoor tube temperature sensor：
System doesn’t turn off, and the LED digital screen of the operation panel displays “E3”. System
works under the mode without indoor tube temperature sensor.
⑷ When outdoor panel available, the communication fault：
System turns off, and the LED digital screen of the operation panel displays “E4”.
⑸ When outdoor panel available, the protection of outdoor compressor (overloading protection)：
System turns off, and the LED digital screen of the operation panel displays “E5”. (The fault may be
the protection of low on-off voltage, overloading protection or the reacting motion of overloading
relay)
⑹ When outdoor panel available ，the phase failure protection of the outdoor three phases：
System turns off, and the LED digital screen of the operation panel displays “E6. (The fault may be
three phases in reverse connection).
⑺ When outdoor panel available, over-current protection：
System turns off, and the LED digital screen of the operation panel displays. “E7”.
⑻ When outdoor panel available, the fault of the exhaust pipe temperature sensor of the compressor：
System doesn’t turn off, and the LED digital screen of the operation panel displays. “E8”. (The fault
may be the unsteady joint or plug of the temperature sensor or the damage of the outdoor computer
board)
⑼ When outdoor panel available, the temperature protection to the exhaust pipe of the compressor：
System turns off, and the LED digital screen of the operation panel displays “E9”.
7. HS(Y)、HSA(Y)、HSB(Y)、HSF（Y）、HV(Y)、HVA(Y) digital display for the series
air-conditioner faults：
Fault source
PG motor feedback is
abnormal
Plastic temp. sensor is
abnormal
Copper temp. sensor is
abnormal (indoor)
Copper temp. sensor is
abnormal (outdoor)
Display mode
The display
precedence level
“E4”
1
“E1”
2
“E3”
3
“E2”
4
8、H（Except KFR-25G/H）、H1、HA、HB series faults display：
Fault source
Display mode
195
The display
precedence
level
AUX air conditioner service manual
PG motor feedback is
abnormal
Plastic temp. sensor is
abnormal
Copper temp. sensor
is abnormal (indoor)
Copper temp. sensor
is abnormal (outdoor)
Timing light twinkles 4 times in
every 8 seconds
Timing light twinkles 1 times in
every 8 seconds
Timing light twinkles 2 times in
every 8 seconds
Timing light twinkles 1 times in
every 1seconds
1
2
3
4
9、H(Y) model air-conditioner fault display：
Fault source
Display mode
PG motor feedback is
abnormal
Plastic temp. sensor
is abnormal
Copper temp. sensor
is abnormal (indoor)
Copper temp. sensor
is abnormal (outdoor)
Timing light twinkles 4 times in
every 8 seconds
Timing light twinkles 1 times in
every 8 seconds
Timing light twinkles 2 times in
every 8 seconds
Timing light twinkles 1 times in
every 1seconds
The display
precedence
level
1
2
3
4
10. EA、EC、EM、EY、EZ、EAA、EAD、EL、HS1、HSZ、HL1、HLZ、P、P1、ZZ、CZ
digital display series air-conditioner faults:
Fault source
PG motor feedback is
abnormal
Plastic temp. sensor is
abnormal
Copper temp. sensor
is abnormal (indoor)
Display mode
The display
precedence
level
“E4”
1
“E1”
2
“E3”
3
11. All of the other E series except EA、EC、EM、EY、EZ、EAA、EAD:
The display
Fault source
Display mode
precedence
level
PG motor feedback is
Timing light twinkles 4 times in
1
abnormal
every 8 seconds
Plastic temp. sensor
Timing light twinkles 1 times in
2
is abnormal
every 8 seconds
Copper temp. sensor
Timing light twinkles 2 times in
3
is abnormal (indoor)
every 8 seconds
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AUX air conditioner service manual
12. Faults display of 18000BTU~24000BTU wall unit series air-conditioner：
Fault source
PG motor feedback is
abnormal
Plastic temp. sensor is
abnormal
Copper temp. sensor
is abnormal (outdoor)
Fault source
PG motor feedback is
abnormal
Plastic temp. sensor is
abnormal
Copper temp. sensor
is abnormal (outdoor)
Non-digital tube displays:
Display mode
The display
precedence level
Timing light twinkles 1
2
time in every 8 seconds
Timing light twinkles 2
3
times in every 8 seconds
Timing light twinkles 8
4
times in every 8 seconds
Digital tube displays:
Display mode
The display
precedence level
“E1”
2
“E3”
“E2”
197
Appearance
System turns off
System turns off
System doesn’t
turn off
Appearance
System turns off
3
System turns off
4
System
turn off
doesn’t
AUX air conditioner service manual
APPENDIX 2
Schematic Diagrams of some Controller Board
1. Schematic Diagram of Controller Board of E Series Air Conditioner with Display Screen
(FUJITSU Chip)
1
2
3
4
5
6
CN9
1
FUSE
3.15A/250V
CRV1 ZNR 1
104/275V 14K/681 2
X4
CN7
1
CN5
J?
2
1
CON2
CN1
A
FAC
1.5U/450V
BUZZER
1
220V-N
RY4
RY3
+
R37
+12V
R38
510
R102
9
10
11
12
13
14
15
16
M
C3021
IC7
BT136
0.1U/275V
510-1/2W
IC7
2003
JHQ
COM
P
COM
E
7C 7B
6C 6B
5C 5B
4C 4B
3C 3B
2C 2B
1C 1B
STF
DJR
R101
101-1/2W CRV2
C14
8
7
6
5
4
3
2
1
+5V
2003
R29 D10
C10 1K 1N4148
104
C7
11
15
14
4
R40
CN2
C
R35
10
VSS
C1216
C
104 5
P60
6
P61
10U/25V
C4 C5 C6
104
104
104
H
M
L
R8
+5V
R7
R6 K1 +5V
R13
R14
R15
3
P06/INT26
2
P05/INT25
1
P04/INT24
12
R36
C11
103
R3
+5V
1N4007
+5V
Vout
1
2
3
4
5
XZ
SLEEP(DS)
TIM
E(ST)
RUN(SH)
GND
????
??
R8
?? R7 ?? R6
1330 1.2K 1250 1.2K 1100 1.2K
1280 3K
1200 3K 1050 3K
1230 5.1K 1150 5.1K 1000 5.1K
1180 8.2K 1100 8.2K 950 8.2K
1130 12K 050 12K 900 12K
1080 20K 1000 20K 850 20K
1030 36K 950 36K 800 36K
980 82K 900 82K 750 82K
R20????????(1: ??; 0: ??) ?????R28
R40??????( 1: ?????; 0: ????)????????R27
3
D
C1
104
C2
104
100U/25V
1N4007
4
3
2
1
E6
GND 2
1N4007
D4
470U/25V
E2
2200U/25V
CN9
1N4007
D3
E1
3
1
IC2
+12V 7805
1
Vin
D5
IC3
5
SDA GND
6
SCL A2
7
W
P A1
8
VCC A0
AT24C02
+5V
CN1
C3
D2
0057h
C
M
B89N202
R2
D1
2
+5V
R22
Q1
R1
1N4148
P36/INT12
EH-3
+5V
1N4148
R10
1.2K?820
5.1k R39
5.1k R11
5.1k R12
30
29
28
27
26
25
13
P35/INT11
24
P40/AN0
31
P07/INT27
C9
103
1N4148
D7
B
330 R30
330 R31
330 R32
+5V
R34 47K
3
2
1
1K
1N4148
D9
4.7K
R5
10K
R4
10K
3
????
2 REV
1
R33
10K
EH-3
+5V
D6
E5
100U/25V
+5V
E3
+5V
C8
103
CN3
D8
2
1
22K
22K
22K
22K
R23
R24
R25
R26
P32
P37/BZ/PPG
P31
P33/EC
P30/SCK P34/TO/INT10
P72 P03/INT23/AN7
P71
P70
P50/PW
M
P62/RST
X0 P02/INT22/AN6
X1 P01/INT21/AN5
P00/INT20/AN4
VCC
P43/AN3
P42/AN2
P41/AN1
2
1
1K R28
+12V
E4
10U/25V
2
1
5
4
3
2
1
IC1
17
18
19
23
22
21
20
7
8
9
X11 +5V
8M 32
1 T1
R9
1k
OVERCU
D11
R27
1K
CN4
B
8
7
6
5
4
3
2
1
COM E
7C 7B
6C 6B
5C 5B
4C 4B
3C 3B
2C 2B
1C 1B
CN7
EXIT
+12V
R20
R16
R17
R18
R19
9
10
11
12
13
14
15
16
CN5
CN6
ROOM PIPE
104
+5V
4.7K
4.7K
4.7K
4.7K
4.7K
+12V
IC7
A
100
RY5
+12V
W
FAN
5
ROOM
_FAN
+5V IC6
1
RY2
1
RY1
CN6
3
D
Title
Size
Number
Revision
B
Date:
File:
1
2
3
4
198
5
2006-1-19
Sheet of
H:\????? (4)\..\???EN???.SCHDrawnBy:
6
AUX air conditioner service manual
2. Schematic Diagram of Controller Board of EA Series Air Conditioner (Motorola Chip)
6
CN10
VH-3
R
+5
ABCDEFG
CN1
XH-10
-
JHQ
8
DJR
6.3
T1
6.3
T2
6.3
CN9
Out Fan
FAC
1.5U/450V
5
3
1
CN3
XH-3Ò£¿Ø
Valve
1
3
COM1
COM2
COM3
Room Fan
CN8
VH-5
7
DJR COMP L
1
5
1
4
1
3
1
2
1
3
1
N
1
2
3
R23
10K
1X7=470
R15
R16
R17
R18
R19
R20
R21
CRV2
0.1U/275V
Q3
9012
Q4
9012
Q5
9012
14
13
12
11
10
9
8
+
Q7
Q6
Q5
Q4
MR
CP
A
B
Q0
Q1
Q2
Q3
-
C12
104
R39
100
16
15
+5
2003
1
2
3
4
5
6
7
R8
1M
IC3 JL8
R25
R27
R30
1K
1K
1K
R38
1K
C16102
30
7
COM3 26
COM2 25
COM1 24
28
Ò£¿Ø
·´À¡
16
ÊÒÄÚ 11
ÄÚÅÌ 12
R111K
2
5.1K1%
5.1K1%
100U/25V
1N4148
10
¹ýÁã
1
13
R5
1K
C7 C8 C15C9 C6
104104103102102
14
14
4
13
5
12
6
11
7
10
PTB1
PTE1 PTB2
PTB6 PTB3
9
1
16
9
µç¼ÓÈÈ
2
15
8
ѹ»ú
3
14
23
R37
22K
4
13
22
R36
22K
5
12
20
R32
22K
6
11
19
R31
22K
7
10
8
9
21Ç¿Á¦
PTB5 PTD1
PTB7 PTD0
IQR
8
¾»»¯Æ÷
PTB4
HH
18¸ß
H
17µÍ
L
C
+12
IC52003
C1
104
+5
+5
R24
R3510K
PTD6 VSS
R28
C18
104
3
R26
+5
R3410K
R710k
C10
102 R13R14
10K10K
+5
C4
104
B
R3310K
Q1
9013
R3
10K
CN12
TJC2-2
+12
EEPROM SCL
R2
10K
CRV1
CN4
EH-5-Y
32
PTD7ADC12
5
6
7
8
3
820 1%
B
HGQ D91N4007
+5
ÍâÅÌ
E6
D10
R4
D7 1N4007
R9
R10
D6 1N4007
3
29
R1
10K
+5
R6 1K
104
2
4
3
1
D1
C10
SDA
NC SCL
NC WP
NC
+
ROOM
PTA2
£¨164£©SDA/EEPROM SDA
CN6
EH-2
2
1
PIPE
PTA4 PTA3
£¨164£©31
SCK
PTA7 PTB0
104
4
27
15
2
6
OSC2 PTD5
PTE0
REST PTA0
VDD PTA1
PTD2
PTA4
PTD3 PTD4
C9102
C13
FUSE
OSC1
R48
R47
R43
R40
4
4.7K
4.7K
4.7K
4.7K
R22
47K
XH-3
1
2
3
·´À¡
1
RY1
+12
1
E3 X1
8M
100U/25V
D
0.1U/275V
IC4 2
C
R24 SPEED R28 SPEED R26 SPEED
SW
1.2K 1330 1.2K1250 1.2K 1100
IC6
ATM24C02
3K
1280 3K 1200 3K
1050
5.1K 1230 5.1K1150 5.1K 1000
3 D2
D5
1N4007
+12
D3
8.2K 1180 8.2K1100 8.2K 950
IC2
7805
+5
Vin Vout
3
GND
1
D4
E2
E1
2200U/25V 1000U/25V
1X4=1N4007
C1
104
2
1
A
RY2
MC3021
5
CN1
XH-3
RY5
3.15A/250V
D8
IN4148
E4
10U/25V
C8
104
D81N4007
RY3
BUZZER
4K
R41
+5
1K
IC5
74LS164
CN5
XH-2
R202
RY4
510-1/2W
O1
+12
2
1
IC4
BT136
R42
510
C15
104
CN2
ZNR
15K/681
+12
+5
+5
R103
100-1/2w
3
1
D
5
4
3
2
1
1
2
3
4
5
6
7
8
9
10
+5
E3 C3
100U/25V
104
12K
1130 12K 1050 12K
900
20K
1080 20K 1000 20K
850
36K
1030 36K 950
36K
800
82K
980
82K 900
82K
750
COM3
·¢¹â¹Ü
COM2
ÊýÂë¹Ü¸ßλ
COM1
ÊýÂë¹ÜµÍλ
A
Title
Size
Number
Revision
A3
Date: 19-Jan-2006
Sheet of
File: G:\ÄÚÏú»ú\Ìؼۻú\·Ö³§Áϱí\23ET\ĦÍÐÂÞÀDrawn By:
1
2
3
4
5
199
6
7
8
AUX air conditioner service manual
3. Schematic Diagram of Controller Board of HS Series Air Conditioner (Motorola Chip)
5
CN10
VH-5
COM1
COM2
COM3
R
+5
STF
6.3
WFAN
6.3
1
2
3
4
5
6
7
8
9
10
11
12
13
R7
R8
R9
R10
R11
R12
R13
R45
10K
1X7=470
R101
Q5
Q4
9012
Z101
12V/1/2W
Q6
9012
+5
9012
3W-11K
CN9
T1
6.3
DJR
ºì/ºÚÏß
1
3
T2
CN11
6.3
L
N
ºì/°×Ïß6.3
µç¼ÓÈÈÔ¤Áô
1
5
3
1
R103
CRV2
100-1/2w
0.1U/275V
E101
R102
IC4
D101
470U/25V
BT136
IN4007
3W-11K
+5
8
COMP
STF WFAN
FAC
1.5U/500V
-
CN4
XH-13
D
7
1
ABCDEFG
6
¸ºÀë×ÓÔ¤Áô
1
4
1
3
1
3
2
1
1
ZNR
14K/681
RY3
RY5
RY4
RY2
RY1 FUSE
JQC-3FF-1HJQC-3FF-1HJQC-3FF-1ZHF-2160-1A
3.15A/250V
JQC-3FF-1H
CRV1
0.1U/275V
R104
2K
C15
104
D
+
Q7
Q6
Q5
Q4
MR
CP
R49
1K
A
B
Q0
Q1
Q2
Q3
-
D8
C13
IN4148 104
R23
1M
100U/25V
X1
8M
C8
104
R51
47K
5
R32
R31
R30
1K
1K
1K
30
7
COM3 26
COM2 25
COM1 24
R39
1K
Ò£¿Ø 28
OSC2 PTD5
PTE0
REST PTA0
VDD PTA1
PTD2
PTA4
PTD3 PTA3
27 R37
15 R36
2 R6
6 R5
3
1
1K
1K ÄÚ»úÊä³ö
1K ËÄͨ·§
1K Íâ·ç»ú
C
+12
1
16
ѹ»ú
2
15
C9
PTA5
102
£¨164£©31
SCK
PTA7 PTB0
29
¾»»¯Æ÷
3
23
R38
22K
4
£¨164£©SDA/EEPROM SDA
PTB1
22
R5022K
5
20
R4622K
6
19
R4422K 7
16
R14
1K
ÍâÅÌ
10
R15
1K
ÊÒÄÚ 11
R16
1K
ÄÚÅÌ 12
5.1K1%
OSC1
µç¼ÓÈÈ
·´À¡
5.1K1%
CN2
EH-5
Q7
9014
¹ýÁã
1
13
C10C12 C5 C6 C7 C4 R3
102102 104 104 104 103 1K
14
PTD4 PTA2
PTE1 PTB2
PTB7 PTB3
PTB6 PTD1
PTB5 PTD0
IQR
PTB4
PTD7ADC12
PTD6 VSS
21
HH
Ç¿Á¦Ñ¡Ôñ
18
H
¸ß·çÑ¡Ôñ
17
L
µÍ·çÑ¡Ôñ
14
13
N
2003
12
11
10
+12
9
8
R48 R47 R43R40 +5
4.7K4.7K4.7K4.7K
C11
104
R24 20K
32
3
C15
R28 36K
104
R29
EEPROM SCL
CN7
XH-2
2
1
R26
R27
Q1
9014
R341K
SM2
R4
10K
Vin Vout
1
2
3
4
5
6
7
8
9
10
3
C1
2200U/35V 104
1X4=IN4007
A
2
E1
1
+5
C2
E2
104
100U/25V
E5 C16 C16
104 104
100U/25V
E5
100U/25V REC
HS0038A
3
R
2
+
1
R15
E2 100
C12
4.7U/25V
104
LED4
LED2
CN102
XH-13
1
2
3
4
5
6
7
8
9
10
11
12
13
G F E D C B A
D4
IC2
7805
104
IC6
ATM24C02
1
+ NC
3
WP
NC
4
SCL
NC
2
SDA-
R2110K
+5
A
R2010K
COM1
COM2
COM3
8
7
6
5
Title
+ R
Vin Vout
GND
1
+12
3
PZ
C14
GND
D3
IC2
7805
SW
+5
D
DP
E
C
DI2
B
A
F
G
DIG1
+5
2
D5
IN4007
12K
10K
R4210K
LED3
C3
104
D1
CN1
XH-3
3 D2
1
B
10K
R41 10K
R2
10K
R1
10K
+5
R25 10K
RUN
PIPE
B
Q2
9014
8
1K
R17
Q3
9014
CN5
JZC-3
+12
9
R47
R19R18
5.1K1%
ROOM
EXIT
C18
103
CN8
XH-2
2
1
D7
IN4148
1
2
3
4
5
4
D6
IN4148
+12
Q9
9014
IC1 JL8
C
CN6
XH-2
2
1
+12
1KR35
1
2
3
4
5
6
7
IC5
74LS164
CN3
XH-3
1
2
R
3
+
R46
100
+5
E3
+5
O1
P521-1
BUZZER
4K
E4
10U/25V
TIME
SLEEP
IC5
14
13
12
11
10
9
8
+5
-
Size
Number
Revision
A3
Date: 19-Jan-2006
Sheet of
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Drawn By:
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AUX air conditioner service manual
4. Schematic Diagram of Controller Board of E Series Air Conditioner with Display Screen(with
Renesas Chip)
1
2
3
4
5
6
7
8
CN10
VH-5A-3
1
VCC
5
3
1
FAC
R9 R10
10K 10K
IC3 104/63V
8
A0 Vcc
7
A1 WP
6
A2SCL
5
GND
SDA
CRV1
0.1u/250V/K
1
1.5u/450V
D
SCL
SDA
R101
1
2
TT
IC7
BT136
D11
R102
3
VCC
VCC
NC
1
R36
10K
IC6
SW
6*6*7
E5
100U/25V
C13
104/63V
D9
1N4007
R29
510R
R33
0057U
4
22K
VCC
2
1
15
3
14
4
13
5
12
6
11
7
10
8GND
R8
5.1K/FC6
104
32
31
30
29
28
27
26
25
24
23
22
21
20
19
18
17
595_DA/SLP
595_SH/TIMER
595_CLK/RUN
DJR
YSJ
NFJ
FLZ
4TF
WFJ
·ç»ú·´À¡
ºìÍâ½ÓÊÕ
¹ýÁã¼ì²â
R23 VCC
10K
R34
9
SS9012
Q1
2
R1
C11
XH-3AW 103/63V
2
27K
12
4
1
2
1
30A
COMP
11
SLI-S-112DM
RY1
10ÄÚ·ç»ú´¥·¢
9
+12V
C14
104/63V
3
4
1
2
5A
1
JHQ C
SJ-S-112DM
RY4
100R
100
1
N
R19/R15
595Çý¶¯
10k/22k
R20/R16
Ëĵµ·ç
10k/22k
R21/R17
ÍâÅ̳ý˪
10k/22k
R22/R18
H¿î
10k/22k
R34/R35
µ¥Àä
10k/22k
3
1
4
5A
X2
2
4WVO
1
SJ-S-112DM 3
RY3
3
1
R35
10K
20K
3
R22
10K
a R18
22K 4
Q2
SS9013 R21
10K
b R17
22K 5
R20
10K
c R16
22K 6
R19
10K
d R15
22K 7
C15
104
1
2
16
2
15
3
14
4
13
5
12
6
11
7
10
16 JHQ
WFAN
4
5A
2
+12V
SJ-S-112DM
RY5
15 4WVO
W1
1N5221B
8
8GND
ULN2003A
¸´Î»µç·¶þÑ¡Ò»
9
B
14 WFAN
13
12
CN8
1
2
3
4
5
11
1
3
R25
3.6K
R3
10K
3
Ñ¡ÐÍÅäÖñí
3
R2
330R
1
·ç»ú·´À¡
4.7U/25V
E9
3
2
1
104/63V
C4
D10
1N4148
DJR
IC5
R5
ÌøÏß
R14
47K
1
13
R27
VCC
VCC
L
14NC
VCC
R4
D12 10K
1N4148
4
SJ-S-112DMQ
RY2
15NC
+12V
1
·ç»ú·´À¡
2
16NC
BUZZER
4K
M37544
X1 4M
B
CN7
16
ULN2003A
IC1
1
E2ROM_SDA
P12/SCLK
TxD/P11
2
E2ROM_SLCK
P13/SRDY
RxD/P10
M H L
BUZZER3
P14/CNTR0
LED7/P07
M
4
P20/AN0
LED6/P06
H
5
P21/AN1
LED5/P05
L
6
P22/AN2
LED4/P04
EXIT/HGQ
7
TXout/LED3/P03
P23/AN3
ROOM 8
P24/AN4
LED2/P02
PIPE 9
P25/AN5
LED1/P01
10
VCC
CNTR1/LED0/P00
Vref
11
INT0/LED13/P37
RESET
12
INT1/LED12/P34
CNVss
13
VCC
Vcc LED11/P33
R51
14
Xin LED10/P32
5.1K
E4
1MR50 15 Xout LED9/P31
C7 100u/25V
16
Vss LED8/P30
104
R7
5.1K/FC5
104
PIPE
8
display
R28 R24 R26
12K 8.2K8.2K
VCC
CN4
7
ÍâÅ̺ͻ¥¸ÐÆ÷ÐźŶþÑ¡Ò»
2
1
ROOM
BUZZER 6
+12V
1
VCC
R6
5.1K/FC3
104
CN3
5
4
3
2
1
R30 R31 R32
10K 10K 10K
CB1
JUMP
VCC
2
1
EXIT
CN6
VCC
IC4
510R
510R
510R
CN2
5
R13
R12
R11
D7
1N4007
C
NC
2
NC
3
MOC3021
3
3.15A/250V/F
1
2
10A
510R/2W
1N4148
R37
820R
FUSE
CN9
VH-3A-2
G
1
D8
1N4007
D6
1N4007
CRV2
100/2W
X2/0.1u
C10
102/63V
AT24C02A
HGQ
2
X2
1
2
3
4
CN11
TJC2A-2A
U
C9VCC
D
N
ZNR
10
9
+12V
C12 E8
104/63V100U/25V
+12V EH-5AW
²½½øµç»ú
CN5
3
2
1
ºìÍâ½ÓÊÕ
C8
103/63V
CN1
3
2
1
XH-3A-R
IC2
L7805CV-ST
1
Vin Vout
3
D3
1N4007
H
M
L
R24 R28 R26
VCC
GND
D2
D5
+12V
1N40071N4007
R38
10K
35»ú·çËÙ
1180 1050 900
µç×èÑ¡Ôñ
8.2K 12K 12K
A
2
A
ºìÍâ½ÓÊÕ
VCC
E1
2200U/25V
C1
104/63V
D4
1N4007
C2
104/63V
E3
1000U/25V
Title
D1
1N4007
Size
Number
Revision
A3
Date: 19-Jan-2006
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AUX air conditioner service manual
APPENDIX 3
Conversion Table of Major Units
1. Conversion Table of Pressure Units
Unit
Pa
kgf/cm2
Atm
mmHg
Psi
Pa
1
1.02×10-5
9.87×10-6
7.5×10-3
1.450×104
kgf/cm2
9.8×104
1
9.68×10-1
7.36×102
1.421×109
Atm
1.013×105
1.033
1
7.6×102
mmHg
1.333×102
1.36×10-3
1.316×10-3
1
Psi
0.68948×104
7.0327×10-2
6.80517×10-2
51.711
2. Conversion of Energy Units
1kJ＝1000J
1kcal=1000cal
1kcal=4.1868kJ
1BTU=0.252kcal=1.055kJ
1kcal=3.968BTU
1kJ=0.9478BTU
1W=0.86kcal/h
1HP=745.7W
1 USRT=3.024kcal/h=3576W
1 Japan.RT=3320kcal/h=3860W
1 Horsepower=735.499W, simplified to 735W ( 1UKHorsepower =745.7W)
1kcal/h=3.9683Btu, simplified to 4Btu
1W=3.412Btu/h
3. Conversion of Temperature Units
t=T-273.16≈T-273(℃)
F=(9/5)t+32(℉)=1.8t+32(℉)
202
1.46885 ×
109
1.93285 ×
106
1
AUX air conditioner service manual
4. Heat Conductivity Factors of Several Common Used Material
Material
λ（kJ/m·h·℃）
Material
λ（kJ/m·h·℃）
Copper
1382
Cork
0.17-0.25
Aluminum
733
Air Interlayer
0.25
Steel
163
Water
2.1
Frosty layer
2.1
Glass
2.7-2.9
Fibre Glass
0.17-0.21
Saw Timber
0.25-0.34
Glass Cloth
0.13
Plywood
0.62-0.84
Slag Wool
0.21-0.34
Polyurethane Foam
0.042-0.11
5. Basic Property of Substitute Refrigerant
Property
R-22
R-410A
Refrigerant Composition
R-22
R32/R125
100
50/50
23/25/52
ODP
0.05
0
0
GWP（100Y）
1730
1700
1530
Toxicity
None
None
None
Combustibility
Incombustible
Incombustible
Incombustible
Thermo-ph
Azeotropic Prop
---
Subazeotropic
Subazeotropic
ysical
Boil Temp（℃）
-40.8
-52.7
-43.7
Properties
Critical Temp（℃） 96.1
72.5
87.3
Refrigerati
Refrigeration
on
Pressure（Mpa）
2.17
3.38
2.31
Properties
Evaporation
0.62
1.00
0.64
3.50
3.38
3.59
Exhaust Temp（℃） 97.2
95.1
86.7
0.17 以下
4～6
（Mass Ratio ％）
Environme
nt
Protection
Safety
Pressure（Mpa）
Pressure Ratio
Slip Temp（℃）
0
203
R-407C
R32/R125/
R134a
AUX air conditioner service manual
Refrigeration
100
141
101
COP（%）
100
92.5
97
Lubricate Type
Mineral Oil
POE
POE
Inter-solubility
Good
Fair
Fair
Amount（%）
Lubricate
204
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